Hello, I’ve been suffering from itching in my genital area for 4 years…

Hello, I’ve been suffering from itching in my genital area for 4 years now, especially on the labia. I’ve tried everything and tried many treatments, nothing helps. What should I do? What is this? During all this time only one ointment helped me — TRIDOX — but after long use it stopped helping. Maybe I think it’s from nerves, I don’t even know. Please help me.