Hi, do you have hpv at all? I know usually they say it doesn’t cause symptoms but it’s also known to cause discharge, itching, pain, burning, discomfort. I’ve got high risk hpv and my vag burns and hurts everyday but my gyn said it’s not from hpv but I don’t have anything else so I think its from the hpv. Hpv effects everyone in diff ways. Some don’t get symptoms, some do. You should get a DNA test
Have you been tested for STDs? Have they talked about an ultrasound to look for an ovarian cyst or anything? What about being tested for a urinary tract infection?
Endometriosis can cause pain like you describe, but doesn't typically cause the discharge. Pelvic inflammatory disease may be a cause, which can be caused by untreated/uncured BV, as well as STDs. Sometimes they don't know the cause.
Keep following up with your doctor about this. If your doctor isn't working with you, find another. Maybe try a Planned Parenthood, who are really the best at women's health care.
I hope you feel better, and let us know how you are doing!