Courtney, you can do this! I'm not going to let you go back to the way things were, and (more importantly) YOU'RE not going to let yourself go back, either.
You had a rough week, yes, and you will probably have rough weeks again in the future, but that's not what matters! What matters is all those good weeks in between. Is there a chance that you didn't lose a lot this week? Yes. But it's not like you gained it all back, either! Think of how far you've come and how hard you've worked- I know you don't want to undo all that.
So today, get right back on the horse and stay within your points. Go work up a sweat, either at the gym or with a video. You can't change what you ate yesterday or the day before, but you CAN control what you eat today.
As for the drunk munchies, I struggle with this a lot too. I think the key is to not let yourself get drunk enough to become irresponsible--you can be kind of drunk and still be sober enough to know that eating fast food is a bad idea, y'know?
And I'm serious, if I know I'm going to be drinking, I always ALWAYS have a contingency plan for eating. Like, save calories for a Lean Cuisine pizza. Eat tons of popcorn (4 cups of some brands is 1 point, I believe). Keep a snack in your purse. Eat something with carbs BEFORE going out (that might be a good night to eat something like whole grain pasta or brown rice with your dinner).
Remember not to be too hard on yourself. Learn from this and move on--I think you're going to be just fine

All in all, you're doing awesome!
As for me, I weighed in this morning and lost a LOT more than I expected to- I think I had a huge drop after TOM ended, so 3 pounds seem to have disappeared overnight. Unfortunately, I'm going away for a conference for work and won't really have internet access from this Thursday until the following Sunday (10 days), so this will be my last Sunday weigh-in until two weeks from now! I'll probably weigh in one last time on Thursday morning before I leave, just so I can keep track of whether I gain or lose while I'm there. I'm nervous about it...no gym time at all and all catered meals. I think my only hope will be to be really careful about portion control.