From what you are saying, it don't sound like you're dealing with a yeast infection. I do suspect it may be something you are using to clean the area with. Never ever use anti-bacterial soup or wipes to clean the vaginal area. You should also stay away from deodorant soap and any soap with perfume in it. To restore the PH balance I'd suggest you mix 1/2 cup of warm with with 1/2 cup of Apple Cider Vinegar and rinse the vaginal area a couple of times a day, this should help stop the itch. I'd also suggest after drying the area you use some petroleum jelly to cover the vagina to keep the moisture and it will provide a protective shield when you urinate.