I've gone thru menopause and so am not dealing much with my endometriosis. But I do still have some pain that the doctor attributes it to scar tissue. I wonder if it's possible that your pain is caused by scar tissue rather than endometriosis. I learned that some bodies build more scar tissue than others. After my first surgery to remove endometrium my internal organs adhered to each other instead of being free to move as they naturally are. They found the scar tissue during a second surgery.
I think that the only way to accurately diagnose endometriosis is thru laprascopic surgery. Now a days this form of surgery may not require general anesthesia. If I were you I would consider surgery so that I'd know what was actually happening.
I was told that I could still conceive even tho I had endometriosis. Conception depends on the egg being able to pass thru the fallopian tube into the uterus. Endometrium can block the tube but if it doesn't one can still conceive. My fallopian tubes were not blocked in my case, at least early on.
My cousin conceived with no difficulty in spite of having endometriosis.