No period!

I am beyond annoyed. I havent had a period in years. My very first period was when i was 14. After that it came a year later then nothing! I am now 21. I had went to the doctors when i was 19, turning 20. I had lost my virginity when i was 19 so i went to get checked by my gyn. I told him about my problem he gave me provera then birth control. I started to get my periods regularly but after around my third period i stopped taking birth control because my breast have became soo sensitive that i couldnt even touch them without them hurting. Since i stopped the birth control i have not gotten my period. In the begining of this year i started to have really bad pain in my pelvic area, i went to the ER and got an ultra sound done but found nothing. They told me i was gettin pains because i wasnt having a period....sounded weird cause i went years without a period & never had pain. I went back in april this year to my gyn, he told me there wasnt anything he could do about the pain & he again prescribed provera (but only prescribed it to me for the month of april) & said maybe the pains are caused from no periods. Ok, so i got my period april 26, 2014. Lasted 8 days. I then had unprotected sex May 13 & also the 17th. I spotted very little on May 21, after that no sptting. Then i never got my period but im not pregnant because i have gotten checked when i went back to my gyn for a pap smear. It is now july & i have no period & its starting to frustrate me because its been almost a year now with me & my fiance trying to get pregnant. Idk what to do.