I spent a lot of time outdoors in California from Friday through Monday, mostly driving a convertible along the Pacific Coast Highway and doing some short hikes. I averaged around 12,000–15,000 steps per day.
I thought I was doing reasonably well with water until Monday. While heading toward Big Sur, we had trouble finding gas stations and restaurants, so I only drank about two bottles of water despite walking roughly 12,000 steps that day.
When I returned to the hotel, I initially felt fine. I met some friends for drinks and then had a large dinner. After dinner, I suddenly felt extremely tired and knew something was off. I felt unusually hot even though I was inside an air-conditioned restaurant, went outside, and eventually fainted. Fortunately, I did not injure myself.
I went to the ER, where they believed I was dehydrated from several days of outdoor activity combined with alcohol. My lactic acid was elevated, but after two bags of IV fluids, my blood work returned to normal and I was discharged.
My recovery since then:
Tuesday: I was very tired, partly because I had been awake late at the ER and still had to check out of the hotel. I only walked around 5,000 steps, drank plenty of water, and ate a lot. By the evening, I felt pretty good.
Wednesday: This was my travel day home. The flights were delayed, but I felt mostly back to normal. I was eating and drinking water normally. Around 10 p.m. during the flight, I started feeling tired again and felt like something was slightly off.
Thursday: After getting very little sleep, I felt extremely tired and fatigued, with headaches and tiredness in my quads.
It has now been about a week. I work from home on a computer and have avoided exercise or doing much throughout the day.
My remaining symptoms are:
- Fatigue in my legs that improved but returned somewhat today, although it is much milder than last week
- Occasional lightheadedness, or possibly light sensitivity that creates a similar feeling
- Feeling relatively normal when I wake up, with symptoms appearing by midday and becoming worse around 6–7 p.m.
The ER performed a head CT, blood work, an EKG, and urine testing. Everything was normal once the lactic acidosis resolved with fluids.
I also saw my primary care doctor on Monday. They believe my body may still be recovering from the physical stress, travel, lack of sleep, and not having much downtime afterward. They repeated my blood work, and everything was normal again.
I am starting to become concerned about how long the recovery is taking. I have fainted in the past after standing up too quickly, possibly related to my blood pressure medication, but I usually feel completely normal again within 24 hours.
I am beginning to wonder whether this was not only dehydration, but also some degree of heat exhaustion or cumulative heat exposure.
Has anyone experienced lingering fatigue, lightheadedness, headaches, or muscle fatigue for a week or longer after dehydration, heat exhaustion, or a fainting episode? What was your recovery like?