I got COVID pretty badly and for a month or two after I just felt like I had no gas in my tank - I'd try to vacuum the house, for example, and I couldn't get through it in one go. I thought "Oh, this is that fatigue they've been talking about." But then that sort of wore off and I no longer lacked the energy to do stuff like that, except I just couldn't bring myself to do those things. I'd be sitting there thinking "I really need to vacuum," but it was like an insurmountable hurdle to go to the closet and get the vacuum out. Once I did, I could do the house without issue.
One of my employees had COVID about the same time as me, and we were talking about it when we were both back. Damned if she didn't start describing the same sort of psychological fatigue-like thing. I was dumbfounded.
It lasted like another couple months and slowly went away, but man it was a bitch.