There's absolutely nothing you can do about what you did yesterday.
Move on, make better choices, and forgive yourself.
At holidays and celebrations, I enjoy myself and try not to worry about counting points or calories too much. (Obviously I don't gorge myself to the point of being sick, but for example I had a medium sized slice of chocolate pie for dessert yesterday. Yum!)
If you're feeling thicker, it could just be the fact that you're retaining water -- would you have happened to eat a large amount of sodium over the weekend? That definitely makes me feel bigger.
The worst thing you could do is say "Well, I've already messed up, so what's another day of bad eating?" -- just fix it NOW and get back on the horse! I doubt you ate enough to really gain much of anything - (3,500 calories in a pound -- that's a lot of calories that you have to eat ON TOP of your daily maintenance!)
Drink lots of water today and I'm sure you'll be feeling better about it.
My 2 cents!