What does endo feel like?

I have read a bunch on it and it gives general symptoms. BUT my issue is not knowing any personal experiences with it. I think I may have it. I have been having some what feels like my ovary is stuck to something else when I have sex it pulls and hurts so bad every time. I get some burning sensations and random cramps in my uterine area. And pain in what feels like my lower intestines and it hurts sometimes to have a bowel movement and all of this especially hurts right before my period is due. Sometimes it's "normal" and sometimes it starts anywhere from cycle day 25 to cycle day 50 but mostly 33-35 days. I just would like some personal experiences. My doctor doesnt seem to think I have an issue. I've had ultrasounds done and pelvic exams, std and sti testing done and everything comes back clean. I've also heard that it can cause ibs type symptoms which I have been having for just as long as the rest of the symptoms (which I've had for about 7 years) and no one will help. Any information would be awesome..