Severe vaginal itching gynecologist prescribed Clobetasol with no real results?

I’ve been having SEVERE vaginal itching for about 6 months now. All labs (cultures, bacterial) have come back negative, and I’ve gotten them done more than once. It’s located mostly right at the vaginal opening – a bit inside of it and surrounding it on the outside. It seems to be triggered by sex since it usually occurs a couple of days after (not the next day, the day after that) but it has also flared up without sex happening. There has been no change in my soap etc and same thing with my partner – no change. I hang dry all my underwear. My GYN prescribed Clobetasol with no real results. Discharge is not a weird color, odor is different that it was a year ago but not severely alarming or noticeably bad. I’ve been experiencing increased vaginal dryness when it comes to intercourse, but always associated that to birth control. Could it be more? What could this possibly be? I’m really suffering.
My Conditions: Ulcerative Colitis, High Risk HPV (diagnosed less than a year ago, no developments so far), PCOS, eczema (seasonal and only on the inside of elbows)
Meds: Wellbutrin, Lialda, Birth control (sprintec), B12, Folate, Biotin, Forskolin, probiotics