I have had my period for about 3 1/2 years and I am 16. ever since about a year after getting it, every other month I would get very bad cramps on the 1st and 2nd day of menstrating. now it has moved so that every month I have had horrible cramps. I get very shaky and sometimes dizzy. I had sex for the first time 3 months ago and since they have gotten worse. any idea why this could be happening? any suggestions on how to solve this problem? advil and other medications like that don't really help me anymore.