I have been enlisted in the army reserve for 6 years and completed a deployment in Iraq in 2004.
A friend of mine had adhd, and he was on medication, when we were preparing to go they knew about his condition, knew that they could not supply him with it, and decided to terminate his enlistment, and with it all his educational benefits and bonuses.
you can try to enlist, but in all honesty just tell them everything. you will be better off in the long run because eventually it will catch up with you.