I have good news and bad news. I'm the original poster that Pima gave you a link to.
Bad news: Pima is right on the two years, so if you are a senior the two years off of medication will not happen before you begin the academy. There are other circumstances such as: how long you were on the medication, if you took more than one dose or one type of medication per day, and the age(s) you were when you started/stopped the medication.
Good news: You found this website with a wealth of knowledge from the people who have been involved with the military for their whole lives, and lucky for you myself who is currently fighting the same battle as you. I will be glad to give you any and all information I have, and if I forget about this thread please send me a message and I will see it as I sign in 2 or 3 times per week. More good news (hopefully): The two year start date begins the month after the last time you or a family member got a prescription from the doctor/office, assumming your prescription(s) were/are for one month at a time. I stopped taking medication in April 2012, but because that prescription had been picked up and filled, in the eyes of waiver committees it is seen as a took medication through April and did not stop until May 1.
Unfortunately you will probably get an MDQ. On the plus side it is the academy/HQ who decides if you get a waiver or not so there is always a chance. If you keep up your GPA and show that you can be the same person without medication you are heading towards what you need to get a waiver. And go to your doctor, talk to them about the medication and if it is safe for you to not be taking it. Even if you feel fine without you will still need documentation from your doctor stating that you are no longer on medication and are functioning fine without it. My documentation says that and that I should no longer be considered to have the diagnosis.
Good Luck!