I’m doomed- been battling brain fog for 30 years now- very weak, get exhausted easily- so as a result exercise has come to a screeching halt unfortunately- even light exercise wears me out quickly- not sure why- guess dementia isn’t far away-
Can you just walk a few blocks every morning?
I feel for you. I experienced the same thing for about the last decade. It turns out meds I was one were not working for me, but against me and put my brain chemistry out of balance.
Fortunately, I found a doctor who made changes to my meds. I think I know how Rip Van Winkle felt when he finally woke up.