I don't have this, but I would suggest on brain fog days you might want to try eating a salad with a lot of leafy greens and getting some exercise in (a twenty

I don't have this, but I would suggest on brain fog days you might want to try eating a salad with a lot of leafy greens and getting some exercise in (a twenty minute walk should be sufficient). Also, take Omega-3 pills and vitamin D supplements. I'm not claiming this will fix your problem, but it could rule out dietary problems or give you a tool to fight the fog. I wonder also if maybe some nights you aren't sleeping as well and just aren't aware of it. It might be worth monitoring your sleep with some kind of wearable too.