Feeling dumb even after 6-7 months?

Hey I’ve been on wellbutrin Sr for about 6 months now. I didn’t have the craziest extreme side effects. I started with 150mg for about 5 months then boosted to 300mg for a month but I went back down bc it was too much for my brain… so now I’m on 100mg for about 3 weeks now. The issue is, i feel slow. I feel super dumb like words aren’t the same and studying feels like nothing? I forget ALOT like ALOT! Has anyone experienced this even after all these months? Thinking of weaning off….