The brain fog is just awful. I am so tired of being stupid! lol I can't stay focused very long, I can't remember anything, and sometimes I have some aphasia where I can't remember the word I'm looking for. I know it's normal, but that doesn't make me like it any better.
For your knitting, maybe you could start a side project that's super simple? No particular pattern, or something you know really well? I'm just a novice, but the other day I got distracted while knitting and I forgot which stitch I was doing, while it was all still in my hands! It's crazy.