'Long Covid' / 'Covid Long-haulers'

I literally could have written this myself

I feel completely knackered and I've been unable to regain my fitness. I just feel totally fucked, which now feels like its getting worse as I've lost the motivation/energy to keep up with exercise. I've not run in weeks because it just became such a ballache - putting loads of effort in but just being left feeling fatigued rather than making improvements like I normally would. This has also led to me being back at my heaviest weight in years. I've picked up a cold (not Covid again fortunately, as confirmed by a test I had to take related to something else) - which seems to be exacerbating the feelings of shittiness.

The difference being that I think I had it but don't know (had a private antibody test late May which came back negative, but they've since said that in most people antibodies only last 2-3 months and all the private antibody tests are basically scams, so who knows).

Also, I started doing turbo at the end of March, it was horrific at first - splitting headaches by the end, destroyed for the rest of the day, that sort of thing - but I got fitter, lost weight and was feeling much better, although it took a lot more work than it would normally to get me to a certain level of fitness.

Then I got what I thought was sciatica* at the end of July, had to stop riding, got less fit, put on weight again and now I seem to have gone backwards. I've had a persistent problem with headaches - which I never used to get - and I'm about to call in sick because I have a stinking one, again, today and I can't face looking at a screen.

*Which was possibly not sciatica and I currently have something called foot drop where I can't walk properly which my physio thinks is somehow related to my arteries, as it doesn't correspond with nerve endings. But I've never seen a physio so stumped and I'm starting to wonder if it's also related...