I am a 22 year old female. My symptoms started happening about 3 and a half weeks ago. I have had sore/ tingly nipples but my breast itself have not been sore. I have gained almost 5 pounds in 3 weeks. I never feel full, I eat constantly. My whole body aches, especially my back and my legs. It feels like I have worked out but I have not. If I don't eat when I am hungry I get dizzy. I have had nausea one time but it went away after 10 minutes or I eat ate something. I drink a lot of water so I do not see a difference in my bathroom trips. I also have trouble going to do a bowel movement, I have to take medicine to help me go. I have noticed my stomach buldging out a little more than usually, and if someone presses down on it hurts. I do not think it is a cyst because I have had them before and there is no pain during sex. During sex it is very sensitive down there. I get the symptoms like I am about to start my period but I haven't. I just got off of it the last week in January. During that time my period was very light, like a pink color and lasted 3 days. I did take 2 home pregnancy test and they were both negative. What could this be?