I got my period when I was 12 or 13 (can't remember exactly) and my periods were always long, heavy w/ clotting, and cramps so bad I would be doubled over in pain and miss days of school. I went on...and tired of not knowing what's wrong with me. Other, possibly relavent symptoms: fatigue and occasional constipation/diarrhea   Any insight/advice will be deeply appreciated. Thanks in advance.