Definitely keep us posted on what you find out.
could be endometriosis...I had it for 6 years starting at age 13, no one would listen to me.You need to see a GYN
Caffeine can cause strong cramps and cysts. So you might want to try staying away from a lot of caffeine if you take it to see if that helps. If that doesn't help then you might want to get checked for cysts although your body will normally rid itself of them on it's own.
I would suggest talking to a doctor. Sometimes a woman, through no abnormal problems, can have excruciatingly painful periods. Many times birth control can help, so you may want to look into a low hormone form of birth control. However, sometimes, it happens that part of a uterus could be formed oddly which could cause problems. I wouldn't worry too much, because the former seems to be more common than the latter. However, it may be worth going to a gynecologist to get checked out.