To OP: It's great to get advice on certain things from a forum, but in this case I hope you sought AOPA Legal Advise before getting in contact with FAA or your AME (IF your pilot license & medical certificates are very important to you, then it's worth fighting for and doing things the right way.) Thee FAA is not going to feel sorry for you because you came clean. They're job is to hammer the law when it's broken. Again I recommend AOPA Legal services, they'll get you in contact with an Aviation lawyer. OP your alive, and no one was hurt! Give thanks! What's done is done. We all make mistakes. You seem to be learning from yours which is great. Do your best to save your future. I wish you the best.
My Fellow JC'er: This is great learning experience for all of us that driving, flying, or being on duty with alcohol in our system can lead to not only putting your life and the safety of others in danger, but also EXPENSIVE A$$ LEGAL FEES, POSSIBLE JOB LOSS, LOW QOL, as well as PEACE OF MIND.
Ask yourself, is it worth it before cutting it close. All your hard work and sacrifice over the years, is it worth the risk? Don't risk it all over a beverage (beer,whisky, vodka, tequila, rum).
Be safe out there folks.