hi there what you are describing is a rectocele you need a gastro doc they will only see this with a defecating proctogram mri i dont know if you got kids because i was told it was caused throu childbirth try pushing back wall of your vagina back when you want a no 2 its horrible but it really helps you should be able to feel the rectocele this way this disorder can upset your bowels? do you feel like you can never empty bowels loads of abnormal collick also pain in lower spine having too lay down to ease it good luck