Since July I have been having weird symptoms associated with my period. About 10 days before I start my cycle, I wake up with severe nausea. The nausea is so bad that I am on the bathroom floor in a cold sweat that soaks my clothes. This month I actually threw up. (just water because I had not eaten anything). My flow is irregular. Sometimes I am really heavy and other times I just spot. I also have a severely sore abdomen that starts about a week before my period. In August, I was so sore that I was having trouble walking. When my abdomen is this sore I also have trouble going to the bathroom. I cannot have a bowl movement, but I can urinate although it does hurt. Does anyone have any ideas about what could be going on. Oh, by the way, I have taken several pregnancy tests which were negative, but I do always end up having my period anyway. Thanks for the help.