What Causes Severe Itching On The Lips Of He Vagina?

Hi

I am a 53 old female height 5 3 weight 14 stone i been having a very itch on the lip on my vagina right side only I have tryed every cream going I have this for about 10 years now I go around the house in a nittie hoping the air well clear it up but no good every day it hurts eveen when im walking going to the toilet laying in bed weaks me up through the nite im now pulling my hair out