If somebody were to ask me what I did yesterday, I would have to think very very hard. It's easier for me to remember what I did last night and then work backwards towards morning. Or if somebody refers to something that happend the other day I can't even remember what day that happend, or right when i'm about to say something I forget right when I'm about to say it. My mom goes through the same thing but she's 50! I'm twenty years old and I don't think this is normal. I'm a college student, very studious with a 3.5 gpa. Is there a vitamin I can take? Or should I go see a doctor. Somebody told me its because I drink too much diet coke and the aspartame (artificial sweetner in diet drinks) is what affect my short-term memory capacity. Should I really be woried? Lay off the diet coke? see a doctor?