Could your period be coming up? Or are you on any birth control? A lot of them have side affects that could cause that! I was on the depo shot (Horrible) and it caused hunger a lot more, in turn i gained a little weight which made me feel more tired and depressed. Vicious circle : / Or maybe a change in your diet (other than sugar cravings) or taking a certain medication? Lots of things could do it! My advice would be to stay active, the worst thing with feeling down is to stay in the house all the time. Go outside, hang out with friends or family. Go to a movie alone and get some "me time!" Sometimes you got to give yourself a break from everything :) Also, dont know if you watch tv, but i try to turn it off and get some quiet time once in awhile..it helps! Good Luck and Keep Your Head Up!! /