I am 19. I was diagnosed with ADHD when I was in elementary school. I haven't taken Adderall in over 12 years. Due to my job being a trainer in fast food, I am multi-tasking doing 5 things at once (Taking order, money, handing out food, callouts, listening to two separate people at once, etc.) Well, When I go to sit down and learn I can not focus in my college classes, So my doctor prescribed me 20mg Adderall, and to take it 30mins before class to give it time to kick in. Well, So far it hasn't helped me concentrate, just makes me fidget a little more, gives me cotton mouth, then a couple hours later I crash while I'm at work. How do I know when it is working, or if it is working. I really need help being able to focus in my classes, I can't fail. Is my dose to high, or low? How do I bring up if it's not working to my doctor, with out sounding like a druggy?