Pain, Somewhat TMI

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So this is an update from my last post. I have been having pain during intercourse, like burning when it enters and pain in my lower abdomen during it. My back and stomach hurt extremely bad the week before and of my period. I have extreme bleeding the entire period, it normally lasts 9 ish days. It’s always heavy and I produce a lot of clots. I have constipation every single time I have a bowel movement, even if it’s tiny pieces of poop. My yeast results came back normal, Pap came back normal, pelvic ultrasound came back normal, etc. only thing that hasn’t been ruled out is endometriosis and my doctor says that can only be seen through surgery. Is that true? Does anyone have any ideas on what my next steps should be?