I Have Burning And Itching In My Vagina. I Have

I have burning and itching in my vagina. I have been treating it as a yeast infection but seems to be getting worst for some reason I think I have a bladder infection due to shooting pain every once in a while but cannot see the doctor until tomorrow. I was wondering if I could take the medication that I have on hand called CEHALEXIN 500mg that would help until I get to the doctor.