I think I may have Endometriosis, or some other issue. I am an 18 year old female, I have always had very heavy, irregular periods. I am not sexually active, and my mom had Endometriosis. Two cycles ago, there were only 2 weeks between my periods, but this last cycle had 4.5 weeks between. For the past three weeks I have had painful cramping on both sides of my stomach (alternating), to the point of it making me nauseous. It is weird because I typically only cramp on the first day of my period, and NEVER more than that. But this month, I know something is definitely wrong. I have been cramping between periods. Could I Have Endo? If not, what else could I potentially have?