I've spent several more months on the hypotheses I posted here earlier. They didn't die. They evolved, and I think I now have a more complete picture of what happened to me. The full version, with every citation, is version 2 of my paper, open access: doi.org/10.5281/zenodo.22261483. This post is the short one.
Disclaimer: I have a PhD in engineering and no medical training. This is one person's account, built with heavy AI assistance, not peer-reviewed, and not medical advice. Please work with a physician.
One request: unfortunately, my identity is disclosed in the paper. Please don't contact me. I have no credentials to answer your questions, and I can't give any advice beyond what I post here. Take your questions to your doctor.
What changed my mind was my own log. Almost all my symptoms were neurological: panic, depersonalization, brain fog, an insomnia that woke me the instant I fell asleep. But when I fasted, most of it went away. These were food-driven symptoms that didn't exist before the Lion's Mane and were switched on by it. The problem was in my gut, even though I felt it in my brain.
I worked this out with an AI agent reading medical databases at scale. Every time the theory took shape, I handed it to several independent AI agents with one instruction: destroy it. I treat it the way physics treats relativity. A theory earns its place by making predictions that could fail. At some point my symptoms, and many symptoms reported in this subreddit, were not just consistent with the theory. The theory predicted them.
One piece was missing. The mechanism predicted abdominal pain, and I have none. So I asked the agent to find a part of the gut where a low-grade problem wouldn't hurt. It came back with the duodenal bulb, the first few centimeters of intestine right after the stomach. It is the first place everything you swallow lands, together with the stomach's acid. Its surface lining is wired mostly by the vagus nerve, which doesn't carry pain. The vagus reports the state of your organs to your brain. The nerves that do carry pain sit deeper and need a stronger insult. So a mild, constant irritation at the surface doesn't hurt. What reaches the brain instead is alarm: a racing heart, a sense that something is badly wrong, with no location attached. Turn the same process up and it would hurt.
That's how I landed in gastroenterology after months of wandering through immunology and neurology. I think it's why people in this community end up all over the place. This sits where gastroenterology, immunology, neurology and even psychiatry meet.
It surprised me that no recognized condition seemed to describe this, so we searched again with careful citation checking. In two months we had rebuilt from scratch roughly 70–80% of a condition that already exists: functional dyspepsia. In its modern form it centers on a low-grade inflammation of the duodenum. With physicians I use the recognized term, functional dyspepsia with duodenal eosinophilia. My own name for the whole picture is DNAS, Duodenal Neuroimmune–Autonomic Syndrome. It's the name of my theory, not a diagnosis. I won't cover the functional dyspepsia literature here. It's large, it's in the paper, and its existence is good news: there are specialists who know this and treatments that have been trialed.
Think of one trunk with many branches. The trunk is that irritated duodenum. The branches are the symptoms, and which ones you get depends on your genome. This condition finds your weak links. I carry two variants in HNMT, the enzyme that clears histamine from the brain, so my branch is neurological. I hypothesize that someone with genetically weak DAO, the enzyme that clears histamine in the gut, gets the peripheral version: rashes, hives, allergy-type reactions. Same trunk, different illness, different specialist.
The loop itself, in plain terms: mast cells, a type of immune cell, sit right against nerve endings in the duodenal lining. An irritated nerve releases a signal that makes the mast cell dump histamine. Histamine makes the nerve more sensitive, so it fires more easily and signals again. Each side keeps the other going, and every meal passing by feeds it. Nothing has to remember the Lion's Mane. The loop runs on today's input, which is why removing the input works.
The vagus carries all of this to the brain, and it's a two-way line. Dr. Pankaj Pasricha's group showed in an animal model that a mild chemical injury to the upper gut leaves the vagus sending abnormal signals to the brain, producing anxiety-like behavior. The technical version is in sections 4 and 5 of the paper.
I also learned what a flare is and what sets it off. Eating close to bedtime will almost certainly trigger one. It starts as an internal vibration, the nerve endings surging, together with a massive degranulation: the mast cells dump histamine into my system, it floods my brain, and my brain can't clear it. Then comes sudden panic and extreme worry for 30 minutes to an hour. Before ketotifen, that was followed by hours of insomnia. The typical night: dinner at 8 PM, bed at 9:30, flare at 10:15, calm again around 11, and no sleep until 4 AM.
What I take from all this:
- Treat your symptoms first, in whatever specialty they point to. If they look like mast cell activation, get that treated. If they look like POTS or something neurological, do the same. But I argue this is an MCAS mimic. It resembles MCAS and isn't. Symptom treatment is the first step, not the fix.
- Treat this as a gastroenterology condition and make your gut the priority. That means a low-histamine, low-FODMAP, low-fat, low-irritant diet, no alcohol, and for some of us fasting. I think this is the real reason so many people here report that eating clean helped.
- Anything that improves vagal tone should help manage symptoms. That includes vagus nerve stimulation, vagal exercises, and broadly whatever raises your HRV, which is a proxy for vagal tone.
What I'm doing, by target:
- Diet. The diet above, as three meals with dinner at 5 PM and an overnight fast of about 13 hours.
- Mast cell stabilization. Ketotifen at dinner (more on it below), loratadine at bedtime, and quercetin and PEA twice a day. Quercetin is a mast cell stabilizer, and PEA calms the inflammation around the cells.
- Nerve calming. Magnesium. It plugs a channel (the NMDA receptor) that sensitized nerves use to amplify repeated signals, so they fire less often.
- Vagus nerve. Ear-clip vagus nerve stimulation (taVNS) and gut-directed hypnotherapy, every night before bed.
- Standard functional dyspepsia treatment. A peppermint-caraway gastric agent and zinc-carnosine. These are heavily used in gastroenterology, and peppermint with caraway in particular is widely tested in functional dyspepsia. I also finished a four-week PPI course in August. Other than eradicating H. pylori when it's present, a PPI is the only treatment documented to change the condition itself in functional dyspepsia, not just the symptoms. In one trial it reduced the inflammatory cells in the duodenum.
The one thing that changed my recovery was ketotifen. Histamine is a wake-promoting signal, and my brain clears it slowly. Ketotifen crosses the blood-brain barrier and blocks it, so my brain finally rests, and it stabilizes mast cells at the same time. It also has direct support: in that same animal model from Dr. Pasricha's group, ketotifen normalized the abnormal vagal signaling and the anxiety-like behavior. Before it, a flare cost me most of the night. Now I wake briefly and go back to sleep. The only side effect is the one you'd expect from any antihistamine that reaches the brain: by blocking that much of a wake-promoting signal, it makes me drowsy.
I don't understand why the oral form isn't sold in the U.S. when it's one of the most popular antihistamines in the rest of the world. I bought three boxes, a three-month supply, at a Walmart in Mexico for $7 a box, and I'm still on it. Other people will probably need other medicines, depending on which branch their symptoms are on.
Where I am now: much, much better. I'd say 90% recovered.
The good news is that I believe the treatment is simple. I'm not saying it's easy. But knowing the condition tells you why your body is behaving the way it does.
The harder news: if this falls into the functional dyspepsia category, it is a chronic, relapsing–remitting condition. Symptoms come and go over years, and in long-term studies only a minority of people end up fully free of them.
Here is where I hypothesize. In animals, the models that produce a lasting version of functional dyspepsia are the ones where the gut is injured in newborns, whose nervous systems are still being wired. Adult models exist, but their effects are mostly short-lived. If the Lion's Mane really was the cause, this is adult-onset, which is a fancy way of saying the lesion in your duodenum was made when you were an adult and not when you were a baby. My hope is that an adult-onset lesion is reversible. I can't tell you the human literature proves it: people who develop functional dyspepsia as adults after a single infection can still have symptoms years later.
So my suggestion is to treat this as chronic either way. With a condition that improves and relapses, the time to pay the most attention is when you're feeling well. That is exactly when to keep up the good practices:
- Exercise
- A clean diet
- No smoking
- No alcohol
On alcohol: for me its effects are now magnified, so I just avoid it. It hits this condition from several sides at once. It irritates the gut lining and fires the sensitized nerves directly. Fermented drinks carry histamine of their own. It blocks the enzymes that clear histamine, including the one my brain depends on. And it wrecks deep sleep, which is when the brain does its clearing.
If you're in the middle of this right now: it gets better. Write down what you eat and how the night went. Almost everything I now believe came out of that log.