Welcome. I was drawn to your post title: "I am powerless."
In AA, what that means is that you can't stop drinking. That you have lost all power, choice and control.
The problem with admitting powerlessness truly-- to your innermost self-- is that you need to find power elsewhere. It's just plain logic.
Trying to understand what triggers your drinking is, for me, wasted time. It will always get triggered, unless you are able to find a power greater than you that can solve your problem.
That's what the 12 steps of AA are for.