What Causes Severe Pain In Uterine And Bladder Area And Pain During Intercourse?

Ive been in and out of the hospital, and from Dr to Dr, trying to find out what is wrong with me. My symtoms are severe pain in the uterian, and bladder area, and pain during inter course. I have been screened for all the cultures they take, urine was screened, std, everything came back negative. Ive had 3 children, 3 abortions, and all togather been pregnant 17 times in my life, Im 29 right now. All I know is that I am in serious pain, my vaginal tissue has turned white, I have pieces of gray colered flesh that I pass during what is supposed to be my period, I dont have them anymore- no not pregnant- And no one can tell me what is going wrong, Im sent home wit pain killers and expected to live with this pain-that has no cause. Ive had an ultrasound done, in and outer, to heck for cysts, but havent heard anything back. I have had a cystocele, rectocele, entrocele, entrocele, perenialplasty, and another at the samr time, that I cant remember last June. Pleas, please, if there is something they are missing, please let me know. I am lost, in pain, and am not getting any answers.