I went from early teenage years into my mid-twenties complaining to more doctors than I can count about my pelvic and abdominal pain, and abnormal bleeding. In my case I was " too young to have endo" and with my mental health diagnosis, of course it was "in my head" and I was "trying to get attention". Uh-Um.
A laparoscopy was done finally at 23. In my case they found endometriosis, cysts, and adhesions connecting my uterus and ovaries to each other and other organs including my bowels. My nsides were a tangled mess pulling on each other. The surgeon could not believe that I was able to function. Yeah, well, go figure. I sent letters with the surgeon's report to all those other OB/GYN's to let them know of their misconceptions and their negligence.
My heart is with any one dealing with this and want to encourage you to know you have the strength to find a doctor who will listen, they are out there. Hang in there.