Hey Makena,
Don't give up hope! If your goal is to lose weight before the reunion you might be putting too much pressure on yourself - would it help to make smaller goals? Like working out a little more, changing your eating habits in certain areas, etc? Maybe start with a goal weight loss of 5-10lbs? That should get things jump-started and once you do that, chances are you will want to keep going.
I am not reaching my goal that I had intended for my vacation in less than two weeks (I started after Christmas), but I am staying positive because my clothes still fit better, I feel better than if I had not done anything, people are noticing and complimenting me, and I know that if I keep up with this, long after my vacation is over, for all the future reunions, vacations, or whatever... I won't have to feel embarrassed ever again just because my clothes don't fit or because I look fat in my formerly sexy little black dress. That's what keeps me motivated. In fact I'm holding onto that dress and when I accomplish my goals I am going to go out and celebrate in that dress!
As for eating everything in the house, that's not as bad a thing if it's a house stocked with healthy food only.
Good luck!