I really don't mean to sound cold or uncaring with this question, so I hope it isn't taken that way, but...is your husband maybe so controlling because of your alcoholism? It's hard to really give much advice on that part of your post with the little information you've given.
To the other part...I'm not gonna say "Hey, it's ok, it was just one drink." It's not ok, in your situation, and you know that. I will say, you CAN overcome this. Others have, so can you. Use every available resource to help you; AA, supportive family, church, prayer, whatever you've got that you can lean on for strength, accountability, and encouragement, utilize it.
I'll keep you in my prayers.