I have been having very painful sexual intercourse. I need some advice from women who have the same problem.?

This started about 15 yrs. ago. I was treated for endometriosis, and have had two D&Cs, know I have ovarian cysts, but no gyn in FL, MD, VA or DC seem to be able to explain the cause/cure for this. If my vagina were clockface, from 6-12 pm is red, inflamed, and when my husband enters me, it feels like a knife is slicing into me. Steroids, painkillers, valium all have no effect. Our sex life has dwindled to zilch-I no longer get aroused, knowing the only outcome will be pain. It is not a lubrication issue. Can anyone at all help? The quality of our life as a couple has suffered tremendously, and even tho my husband is very supportive, he wishes our sex life were what it once was--great! Help me please!!