Your being anemic is unlike to have anything to do with bad cramping during menstraution. Unfortuantely some women are simply cursed with having horrible cramps during their menstrual cycle. Because yours sound particularly bad, you should go to your doctor and have things checked out.
One fairly common cause of severe cramping is a endometriosis. An estimated 89 million women worldwide suffer from this disorder. Endometriosis occurs when the uterine lining, which is normally shed during a woman's period, is instead located ouside of the womb and in other parts of the body, normally the pelvic cavity. Your doctor can discuss various treatment options if it is determined you have this condition.
You may also benefit from being placed on a hormonal system, such as birth control pills. Many women with severe menstrual cramps find their cramps to be much milder when taking the pill.
For more information on endometriosis, see:
http://en.wikipedia.org/wiki/Endometriosis
http://www.endometriosisassn.org/
http://www.endometriosis.org/
Best of luck!
Emily
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