i was diagnosed with adhd almost a year ago. my doc perscribed me to adderal xr 30mg once a day. i hated it and it made me feel terrible (really drowsy). i hardly gave it a week before i went back and asked him to lower my dose. he gave me 20mg instead and it worked great. i improved greatly in my college classes and it improved lots of aspects in my life. anyways, around february i stopped taking it just because i was wasnt in school anymore and i didnt think i would need it. i stopped taking it and went through almost a depression phase. i didnt want to do anything and i really let myself go. stopped eating healthy and exersicing (which ive always been good about even before my medication). A couple weeks ago i started to finally get out of the dumps when i started to force myself to be social again. i am starting some summer classes in about a week or so so last week i refilled my perscription of adderall xr20mg which worked great before but ive been on it for a week and its not how i remembered it. i feel kinda crappy on it. i dont feel its making me concentrate any better.

now i wonder if its because my body is getting used to it again? if so how long does it take to get used to (it has been a week exactly) 

ive also heard that different foods can affect the meds. if thats the case what time should i take it/ after food/before food/what kind of food?

or could it have something to do with my bad diet that went on for a couple months and just started improving about a 2 weeks ago. and maybe the fact i havent exersiced in forever (maybe the food/lack of exercise is whats affects my crappy mood and not so much the meds). 

i will probably give it some more time before i go back to the doc just in case i need to give it some more time. thanks alot!