Long, irregular periods,infertility, and severe pelvic/lower abdominal pain?

Hi, first off this is a little embaring to discuss, I'm Lacey, 23 yrs old. I have been dealing with irregular periods since I started around the age of 15. They have never been normal or steady. I did not lose my virginity until I was around 19, however I had been experiencing severe abdominal pains, heavy/irregular periods that kept me from school that should have no relation to STDs since I wasn't ually active at the time. I ate healthy, didn't drink or smoke(until the past couple years) so these factors dont seem likely reasons for my problems in my teens. Throughout the past few years I have suffered from physical and ual abuse. I went through multiple s, but due to fears never went to get checked out until about 6 months ago. The GYN said I had chlamydia, as well as a sensitive cervix that bleeds when barely grazed o_O. I was treated for the chlamydia and the GYN never found anything else wrong. After treatment, my problems have persisted. I have never done an ultrasound, although I feel it would be beneficial to discovering what could be wrong. I was with my exfiance for 3 years, and shortly after we hooked up we stopped using protection because I am allergic to latex(but only down there, weird) and I have never been pregnant. My current partner whom I have been with off and on over the past year and a half dont use condoms and I have never gotten pregnant. I may have infertility problems related to my irregular periods and severe abdominal pain. There is also a possibility that I was molested as a child by one of my mothers boyfriends at that time, but I have suppressed too many memories to remember clearly, although I used to have detailed night terrors about him and different things. There is also a history of cervical cancer in my family that my grandmother ped away from, my mother was diagnosed with it but was treated early on, and my older sister was diagnosed with it and treated early on. In my last checkup there were no abnormal cells related to cervical cancer present. I really don't know what this could be, and don't expect to find the perfect answer on this site, but help or advice would be greatly appreciated.