Well, with any medical question regarding the armed forces I would advise you to speak to your local AFCO. However as you say that you've got a pre-rcb in a few months I take it that since you've already been in contact with your AFCO that you've already declared it?
Your problem is that you opted for pills that a doctor prescribed, therefore admitting that you had a medical problems.
What did your AFCO say about it?