That. Is awful. I suspect endometriosis, absolutely. It's agregious that your doctor hasn't looked into that. Your symptoms sound just like my mom's when she had endometriosis and her doctors ignored her for so long that by the time they finally looked she had ovary tissue growing on her liver and kidneys, and it was too late to save her uterus and ovaries at all. Please, please see another doctor and keep pushing until they do the test. Have you been consulting your primary care doctor or your gynecologist?

I cannot stress heavily enough that you need to see a different doctor. What has occurred here is medical malpractice even if you don't have endometriosis - any good doctor is at least going to look into endometriosis and all other avenues before telling you you're fine. It sounds like you're not being taken seriously at all.