I've had my period for nearly 30 straight days, and it's been extremely heavy. Around this time last year, the same thing happened but my period lasted for over 90 days straight and was nearly as heavy. I'm constantly tired, I constantly feel sick, I'm in ridiculous amounts of pain and I've spent more money this month on sanitary products than I have on all of my monthly bills combined. I've had days where it's been so heavy that I can't go to school because I'm changing my pad or tampon every 10-15 minutes. I'm 27 years old, overweight (260lbs.), but exercise regularly throughout the week, and I'm on birth control. Still a virgin, so no chance of pregnancy. I'm scared... what could this be?