Once a couple years back I woke up in such severe pain I almost passed out, took a couple Tylenol and had my mom drive me too the doctor's. He told me it was mettleschmerz, and that one of my eggs had either released too fast or it had exploded I had it happen once again a few months later but went one the pill and have not had any problems since, cramps are also almost nonexistant. I can't say the same for my PMS though