I did the very same thing the last Christmas I drank. I had been trying to moderate, but decided I'd have one glass of eggnog. It turned into a month long bender, and I barely made it out alive. It was so much more horrible than all the other times. The good news is it removed any doubt that I could ever touch the stuff again.
You don't have to return to that awful place. Glad to have you back with us. You can do this.