Im 12 going on 13 and i have been taking adderall for a couple we...

Im 12 going on 13 and i have been taking adderall for a couple weeks now i'm on 30mg but now that its the summer my doctor lowered it to 20mg but i feel like its been helping me in class like i can finish my homework now and i pay attention now in class to. But i have not been hungry lately at all and some times when i get up i get kind of dizzy and my mouth gets a little dry some times to, i feel like i cant fall asleep as easy. But i feel happier when i am on adderall. but for like a couple days i didn't take it and i felt a change i started to get hungry and eat and my mood changed a little though i noticed i wasn't as happy as i am when i am on adderall. has anyone felt a difference on adderall then off??