I have been diagnosed with ADHD,I've been on Wellbutrin SR, for o...

I have been diagnosed with ADHD,I've been on Wellbutrin SR, for one week now and started with 150mg, This week I am to double my dose, I feel light headed all the time, a little lack of sleep and small headaches that move around, fade in and out alot.also Heart Pains now and then too. I've had alcohol and my Dr. said it would be o.k in moderation, when the instructions say not to, So i'll stop. I don't want a seizure. I'm in school and i'm not sure I should be testing this now, as i HAVE TO PASS, all i need is help with attention, not really depression, my question is should I be on this now or at all, what can i expect in the future, and are holistic alternatives good or better? Is it safe to excersize or will i get a heart attack at 23---PLEASE ANY INFO IS APPRECIATED.