if you finish??? Are you not reading this???? STOP NOW!
As for keeping gains, if you did as much research as your post indicates, you prolly dont have the needed aids to get your natural test back anyways so your gains will be fleeting wather you finish what you have or not.
Moral of the story is TAKE CARE OF YOUR HEALTH FIRST. Assuming you do that, do some research and make sure you know what your in for and how to keep gains.