It sounds that one possible cause could be a condition known as ENDOMETRIOSIS.. that tends to get worse over time fro the time you start having periods.. more pain than normal with your cycle and may hurt lower abdomen/pelvis and back..
It is caused by small implants of endometrial type tissue on the structures in the pelvis outside of the uterus..
I would advise that you discuss this further with your gynecologist.
Possible treatments for endometriosis IF THAT IS YOUR CAUSE could be type of birth control that more prevents you from having menstrual cycles as you do now..(anti-inflammatory medicines can help somewhat...other medication approaches could be considered in difficult cases) Other causes of pain such as fibroids should also be ruled out as cause.. pelvic ultrasound should be done to help diagnosis but that alone may not diagnose endometriosis ..
Surgery could be an option ( they may at times use endoscopic procedures and use laser to abalte the abnormal spots of tissue that may lie on the intestines/bladder/ adnexal tissues...
I hope that this information is helpful for you.
Let me know if you have further questions / concerns/ discussion..
I will be happy to get back with you.
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Thank You and Best Regards,
Anthony Bray MD