gaining weight!!

Grrrrrrrrrrrr, I am so frustrated nowadays coz I am gaining weight,huhuhu. My employers left for Argentina last Dec. 18 and since then, I don't have a normal routine anymore and I started gaining weight. I weighed myself the other day and I'm already 57 kg. I gained 3 kg. in just a matter of days,grrrrrrrrrrrrrr. And I still have several Christmas parties to attend to, so I am worried. I just hope I go back to my original weight after the holidays. It's so difficult to control my appetite when there's a lot of foods on sale these days. :(