Sounds like weight shift problem.
Look. It’s clear your pissed off But are still hanging around. So you clearly don’t really want to quit. Just take The rest of January off everything and come back in February. Sometimes a break is all you need.
You’re right of course. I don’t want to quit. But at the moment the payoff isn’t there in terms of enjoyment.
Maybe I should do as you say (and a couple of others have said), and take a longer break.
I’m also going to get my eyes tested, because it’s just occurred to me that the last few days I’ve been knocking things over when reaching for them (glasses etc), or just reaching out for doors handles and missing them ...