I to am glad your safe! Yes, it's a horrible feeling not knowing what happened. Blackouts occur when we overdo it, and there are some real horror stories out there of what can happen in a blackout.
I hope you take this as a wake up call that maybe you want to think about the ramifications of your drinking. Only you can decide if it's time to do something.
Know we'll be here for you either way. Welcome to SR!