Is your sex life satisfying? Is there a subconscious reluctance to have sexual intercourse that you may not be aware of? Dip a sea sponge in a solution of 50% distilled water and 50% Lugols iodoine, insert in your vagina, and leave all day. Before bed time, insert a garlic capsule. Do this for six weeks and see if the condition improves.
You might want to start with 75% water and 25% lugols, or even less, to make sure it isn't going to burn. If not, slowly increase to a 50/50 solution.
If there are critters migrating through the tissues, from rectum to vagina, a garlic capsule up the rosy red anal sphincter before bedtime will help eliminate them.