Hi, for the past little while I have been having extreme vaginal itching, mostly on the inside. It seems to be a repeated thing every month and usually lasts a week and then is gone until the next month. I have seen the doctor numerous times and everytime my swab tests come back negative. I have been checked for BV, yeast infections, STD s, etc. The itching is so unbearable that sometimes I cannot even go to work. All of the doctors I have gone to have not been able to figure out what it is.Please help me