So I've had "brain fog" before, sometimes to the point where I'm really confused or can't remember anything/concentrate. But for the past week or so it hasn't gone away. Everything feels strange, I feel like at any moment I'm gonna pass out or forget where I am. Things that happened earlier feel like they happened a week ago, or sometimes I can't remember them at all. Has anyone ever had something like this this severe? I've been really worried that I have MS or some kind of neurological disease. Please help.. Thank you.