I would be careful with some of the self-help groups. They can reinforce symptoms rather than improve them. A case in point is a friend of mine who thought she had post-covid symptoms and cognitive decline. She went to a similar group and found a lot of very miserable people with depression. When talking to them they had similar stories of lost relatives, lost jobs and general social decline. But all had a common thing which was they weren't dealing with those issues in a healthy ways. It was turning into a drinking club pretty much after the event was over. Even if you had problems this would exacerbate them over time.

There was a hefty dividing line among my friendship group after covid which was people who went down that route and people who went down the health and fitness route. The latter seem to be doing much better in all aspects even if they started in the former group.

I was running 10km once a week before. It knocked me off my feet entirely and I don't run often now which got to me for a few months. But I fought it and can do that again now if I need to. It hurt that it did that to me but it taught me how fragile things are. Also to note I'm a qualified mathematician but some days to months I can't add numbers together and this turns out mostly to be I'm tired or not in the right state of mind rather than anything persistent. Lots of causes - best to look for the obvious ones first.