I like the way you think...

One thing that helps is that a fast weight gain usually will come off as fast as it came on.  I gained four pounds between Halloween and Thanksgiving.  I have lost two and a half of it since November 30.  I am staying at 900 calories a day.  I have three more parties in the next week and plan to drink lots and lots of water at them.  Life happens.  The trick is to get back in the game and not throw in the towel. 

I always weigh myself every morning.  If I do not do that, then I quickly fall into denial.