An ultrasound via vaginal route or a uteroscope inserted via vaginal route to look at the condition
of the cervix, uterus etc, a PAP smear, a
vaginal swab test, a culture
of the
vaginal discharge, a complete STD panel are probably what are required. It could also be an allergic reaction to soaps, cosmetics, douches, erasers etc that you use. Hence eliminate them one by one and see if it helps. It is difficult to comment beyond this at this stage. Do consult your doctor/ gynecologist.