drugs and lifting don't go well together, bro. seriously, i used to be somewhat addicted to stims, from the exact same adderalls you're talking about (they're orange and clear with little beige beads inside, right?), and i lost all my gains i got.
get off the drugs if you need anything to get you through college push for a prescription for modafinil, it's lifter-friendly and gives you a productive clear-headed feeling without a crash or much risk of addiction.
if your doc prescribes you adderall i'm more than sure he wouldn't mind prescribing you something less recreational like modafinil.
as for the benzo's, VERY SLOWLY taper off unless you want to have seizures and be in a psychotic murderous mindstate.
Those "beads" your downcasting are Dexedrine Spansules ER. While I agree that his dosage likely is high, I do not know his age to weight it against body weight. Adolescents have a higher intolerence usually.
I take 15 spansules x2 in the morning, + one in the afternoon and I am fittest I have ever been in my entire life. (8% BF, 190 6" 2") It's ludacris to sit here and say he shouldn't if it's prescribed by his medical overseer.
I would not go as far to call you an idiot, but each person has a unique situation with a variety of variables and that you have no detailed knowledge whatsoever of his situation makes you literally ineligible to offer advice, especially when you don't even know the name of the compound. Even if it is a forum.
I guess my point is, you can completely manage whatever life throws at you, being healthy and fit with your workouts in regularity, while taking prescription medication designed to combat concentration issues which help render you productive in your professional life.
It's not worth losing face at your job/career to gain a couple pounds.
I'd focus on your nutrition and getting your meals in line to get the full benefit of a healthy sound mind from that avenue, before you forsake the benefits of medication designed for your situation.
Please, again don't just offer advice unless your a medical doctor or pyschatrist and you have the info to back it up.
P.S I do agree to try to slowly taper off benzos as fast and safe as you can, consult your medical professional and mesh out a plan.