What Causes Extreme Hunger, Frequent Thirst, Fatigue And Body Aches?

Hi, I am 20 year old women. Starting two weeks ago, I have been feeling abnormal, extreme hunger. No matter what I eat, or whether I eat large or small meals, an hour or two after each meal I feel extremely hungry, to the point where it seems to hurt. Even though I m eating more than usual, I haven t gained much weight, which I find strange since I usually gain weight very easily. I have also been waking up frequently from thirst, even though I drink a normal amount of water everyday. In this last week, I also feel very fatigued and my body aches. Even short naps, which used to help with fatigue, aren t really helping. Also, I am definitely not pregnant. I m not really sure what is going on, so I m concerned...