Endometriosis

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Anyone with endometriosis... what symptoms to look out for? What kind of pain, bloating, constipation? What type of pain with sex? I know it’s different for everyone but I’m desperate... thank you. I’m scared if it’s in my head after going to so many GIs and being told that :(. Also how do you know if you don’t get your period from birth control (nuvaring) but still have pelvic pain?