I wish that I had better news for you but it sounds like what you have is a rectocele. Many women get rectoceles from having babies. I have one and a cystocele and uterine prolapse too (all from carrying my babies and having vaginal deliveries). My rectocele has progressively gotten worse with each pregnancy (I had 3). My OB never told me anything about how all the organs in the pelvic region can be damaged or altered from pregnancy and vaginal delivery. I believe that is why all the celebrities have scheduled C-sections. Their OB's tell them about all the possible damage to the pelvic organs that can occur from vaginal deliveries and they don't have to follow what an insurance company says because they can afford to pay out of pocket.
Anyway, go onto a medical website and type in "rectocele" in the search box. It will give you a lot more information than I could. I am just living with my symptoms from my rectocele because the thought of doing any rectal or vaginal surgery is not worth it in my book. There are always pros and cons to every surgery and the cons never make it worth it if you ask me. I have heard that people that have had rectocele surgery say it takes a long time to heal, have a lot of pain with recovery, and have trouble having intercourse for quite a long time.
Once you know what a rectocele is from a medical website, do a search here on Healthboards by typing in "rectocele". You will get a bunch of insite from other sufferers.
Hope this helps! Hang in there.