Regressing

So... over thanksgiving break (a period of 9 days for me) I think I managed to undo about a month (maybe more? I'm not sure yet) of gains. I pretty much lost all common sense and smoked pot, drank beer, and ate food 24/7. I learned my lesson, I won't do that again, but how do you keep those little nags in the back of your brain away? The ones that say "ah, fuck it, just eat what you want, have a piece of cake" or "fuck it, we all die in the end anway?"