In March 2006, I had a period that went crazy. I had five days of normal, then all of a sudden I was bleeding heavier than I've ever bled. It was huge clots, and just didn't stop. My mom said it looked like the kind of bleeding you have after a miscarriage or after you give birth, but neither of those was a possibility (pretty hard to get pregnant when you aren't having sex..).
It was a Friday when I started the heavy bleeding. That Sunday, I went to the ER at the hospital near my college. They checked my hemoglobin level (it was 12.1, normal is 12-16), prescribed me some BCP to stop the bleeding, and sent me home. The bleeding got worse, and I finally went back to the ER that Friday night. They did a couple of ultrasounds but didn't find anything abnormal, found that my hemoglobin was at 8.4, and sent me home with stronger BCP and instructions to see an OB the next Monday.
Over the weekend, it got even worse. I was going through one jumbo super capacity step-up-from-overnight pad every 45 minutes. I couldn't stand for long, walking long distances was out, and I needed long naps just to make it through the day. My fiance was worried about me, and had driven down to my off-campus apartment to be with me. Sunday night, after 9 days of heavy bleeding and 14 days after my period had started, he convinced me to go back to the ER. I reluctantly agreed. My hemoglobin level was 5.7. They started a blood transfusion and admitted me to the hospital. Monday afternoon I had a D&C, which finally stopped the bleeding. My doctor said that the medications they had given me worked for 99.9% of people with that problem. Leave it to me to be in the 0.1%.