Vaginal burn and itch, also on vulva, irritated clitoris, some discharge, 3 blisters. 3 treatment with antibiotics in 3 months, taking oral probiotic?

Likely infection: Vaginal symptoms and blisters despite 3 rounds of antibiotics - i suspect there is still an infection going on. Possibly yeast or BV or another bacterial infection, possible herpes. Could also be an irritation reaction to something you're applying to the area. Anyway you need another doctor exam. In the meantime, ice in a plastic bag, or doing aveeno (oatmeal) soaks can be soothing. Good luck.