Plateau and losing weight?

So I took like a week long break of my diet, essentially a cheat week, because I thought I had plateaud, and a couple people told me I needed to increase my calories to shock my body. I could have done it a lot healthier, but my week consisted of beer, chic fil a, pizza, beer, cookies, whiskey, burritos, beer, and no exercise. Life of a college student. I didn't count calories, and just ate when I was hungry, and when presented with the opportunity to eat out; I took it. But instead of gaining weight from salt/water retention? I lost 2.5 pounds, what could that mean? Will I gain it back soon? So confused? Should I up my daily calories from 1350 to 1600. I've always been scared to, but seeing as I ate so much and still lost weight, I figure maybe with exercise I can eat more in my days and still lose weight.