Glad you're feeling better Fredrik! It's a nasty illness, and I very much relate to the feeling of "not like anything I've experienced before."

I'm older than you (60) and had it back in late September. Pretty much the same sequence, but a little more... first the *"strange" headache, then waking up for a couple of days with fever and also feeling like I had been beaten up by a group of angry barbarians while I slept, or like I ran back-to-back marathons. Pretty much zero appetite for 3-4 days... after that, just a lingering feeling of "not being 100%" for two weeks.

It was a bit of a mystery for me, and at the time I thought it was a combination of a cold and food poisoning because it had been ten days since I could reasonably have been infected. It was not until six weeks after the fact that my doctor insisted it was Covid, even though it was too late for an effective test.

I'd recommend going light on the working out, when you resume... this thing does something to our bodies, even healthy bodies.

To a speedy recovery!