That text is describing my life since 10 years or so. I am in my 30s and lost the capability to do the thing, _any_ thing, with the exception of going out with friends/family/my partner to do social activities. Everything else is literally impossible for me to do. I’m currently kicking off my second attempt to fix this by talking to a psychologist about it. But I am not very hopeful. Still searching for the root caus…
You probably lost the “finish” muscle. That happens when you lack wins for a long time. Best way to to train yourself to win again. Start, finish, and celebrate a 1h task. Then half day. etc
Finishing small things like cleaning dishes is no problem for me. It gives some sort of gratitude, but most likely not what bigger tasks would give.