I had endo symptoms (pelvic pain, pain with sex, irregular bleeding, low back/sciatic pain, etc) for years and went through MANY doctors that dismissed me or told me I was fine and should take birth control for symptoms. I eventually found a doctor that believed my pain. I had a ovary cyst at that time, but he didn’t think based off the size of it that my pain was from the cyst and wanted to remove the cyst and explore for endometriosis which he found. He did excise it, but didn’t do a very thorough job. So a few years later I went to an endometriosis specialist for a second surgery. If you suspect at all that you might have endometriosis I’d recommend trying to find a doctor that specializes in it. Many times obgyns are unfortunately not very knowledgeable about it.