Welcome back joshlyman. I'd disagree that nothing horrible has happened, drinking and drugging to the point of blackout in itself is a pretty big red flag. And as you said, you don't know what happened.
Many have had those kinds of mornings - and resolve to quit is very strong at first. I think going to a meeting would be a great idea. An even better idea would be committing to stop drinking now, but that can only come from inside you. Are you ready?