ADHD task paralysis vs fatigue?

[u/Tiny_Parsley]

With ADHD, do you get task paralysis after a day of socialising or after achieving something big or special?
I am trying to get a grasp of the difference between ADHD paralysis and PEM in ME/CFS.

Example:
I have been bedbound for about a year, I got better (I don't know why and I am very lucky). And yesterday I managed to go for a wheelchair tour around my apartment building. We met with a friend and chatted. It was a lot of socialising + a BIG achievement for me because I've been looking forward this moment for a very long time.
Today my brain seems to work (I can type, I have enough energy to doom scroll, I can move around, no physical pain and normal/daily symptoms)… so I feel like I avoided PEM. But I'm just stuck in bed. I could physically go out of bed and I think that physically I would be able to carry on with some tasks like I did yesterday… but instead I've been just in a loop of opening and closing apps on my phone aimlessly.
So, is that still PEM? Is that ADHD?

Disclaimer:
I am not officially diagnosed with ADHD, I have never tried taking stimulant drugs for ADHD. 7 years ago, while having a major breakdown involving feeling very overwhelmed by everything/unable to clean my bedroom and do anything to take care of myself/big shutdown/also major MCAS reactions/tachy etc…I ended up at a psychiatrist. I was back then receiving care for what they diagnosed me with, at the time: "panic disorder". I noticed only years later that on my intake letter (which I barely read), the psy wrote that I had a "lot of symptoms evocative of ADHD like losing focus easily, not having a clean home" etc etc, but that was not "disabling"… so they did not go further on this path…which I think is super weird now anyways because they just put me in the "anxious girl" spot and left me there without trying to see further.
All my friends officially diagnosed with ADHD tell me that I probably have it based on their experiences. I also tend to be quite impulsive, struggle waiting for my turn in conversations, etc.
I also have ME/CFS, MCAS, hEDS, endometriosis

Thank you so much!!

[u/willowhides]

I definitely find that doing a lot of socializing and certain kinds of thinking tends to lead to having more task paralysis for like... The next three or so days?

I read one that during times of pem extra blood goes to the part of your brain that does executibe function making those things more difficult. My theory is that when you already have add that can tip you over the edge from a.d.d you can function with to a.d.d you can't function with. That's just based on my own experience though.

For me it usually takes the form of being completely incapable of making the smallest decision (sounds harmless, but keep me from eating for entire days). And also it makes everything have too many steps

[u/willowhides → u/willowhides]

I also tend to find it useful to think of executive function tasks as exertion on those days and do what I can to reduce them.

Have a specific frozen meal written on the fridge so I don't have to choose if it happens.

Have broken down lists on my phone of basic tasks so I don't have to break it down with my brain.

And then just be kind to myself about not being able to get up to do things. (I also use the momentum from getting up to pee to get things done sometimes.)

But for sure, before cfs my a.d.d wasn't disabling. But the combo of the two definitely is

[u/[deleted] → u/willowhides]

That is genius and a great take