Don't throw in the towel! Losing weight is so hard, the worst thing you can do is give up and resign yourself to packing on more pounds. Think about it this way: if you overspend on a pair of shoes, would you then say "Oh, what the hell, might as well blow my rent money on a brand new outfit too!" Try to enjoy the holiday festivities in moderation and think about how happy you'll be when your pants zip.
I think Chrystalle is right - enjoy things in moderation this holdiday, but don't get too upset if you go a little overboard! 
You guys are both right. Thanks for the words of encouragement - I really need them right now!
Commenting by HaloScan
