Not fair

I had such a good time with Sushama, ate so much at Karen's party, did not work out, and in three days gained 6 pounds. omg. So yesterday I went back to the gym, then this morning to the tennis court, it was so cold I wore four layers of cloths, plus my hoodie visor and scarf to make sure the hoodie didn't blow off. How come I can gain 6 pounds in three days, when it will take weeks to get it back off. Not fair.