Re: Labia Itching
You have been tested for yeast infection, right?
You may want to see a dermatologist or a vulvar specialist, as a regular GYN might not be able to handle this.
On the "easier" side, consider that there may be something in your environment that is contributing to it.
Are you sexually active? If so, what kind of condoms, lubricant, etc are involved?
Do any chemicals ever touch your vulva? They shouldn't. Your bath soap should be a sensitive-skin fragrance free type, and you should wash your genitals only with lukewarm water, no soap at all. Never use any deodorant or cream there. Use plain cotton underwear washed in perfume-free detergent, rinsed well, no bleach.
Menstrual products: No perfumes or dyes. Consider a cottony-type pad rather than a plastic-y type. (that was sooo precise, but you know what I mean).
Avoid tight pants, and try sleeping without underwear, so your vulva gets some air.
Hope you feel better!