Absolutely brilliant thread going here -- THIS is the community!! This thread is the epitome of how loving and caring this community is, and I just wanted to take a second to appreciate that.
@OP, I too (along with all these others) used to be in a space where I abused substances, especially alcohol. Remember that you're only 25, and you're well ahead of the game.
As the others, I recommend a break from the sauce -- you want to feel GREAT going for the BT. It's a ride, probably one of the most intense and wild of your life. You want to be sure you're as ready as possible, and that means a clear mind.
Best of luck with your pursuit of the magnificent, and congratulations on being AWARE of the changes you are seeking -- THAT is the first step, and taking the first step means you have already begun your journey.
"Just when the caterpillar thought her life was over, she began to fly."