Hi , the past 2 months my periods have been averaging out to be about 2 weeks late. I'm currently 11 days late today. I've always had a normal 28 day cycle, and no I'm not pregnant. I've been experiencing severe top abdominal pain the the point where I can't talk or even get in a comfortable position. The first time it happened it last for about an hour and I ended up taking ibuprofen because I could no longer handle it. This happened 2 days before my first late period started.Today was the same but this lasted for about 6 hours. I've vomited and also have had tingling hands, arm, and feet. If there is any repetition to this my period should start in about 3 days. Any idea what this could be?