So sorry to hear that.
Take epsom salts, about 2 Tablespoons, and add a little water, whish it around and wipe the liquid and salts onto the blisters. It is best to do this in a shower stall or stand in a bathtub. Let it dry (it will turn white). It will not only stop the itch but it will dry it up much, much quicker. It does sting but you won't mind because of how fast it will heal. Good luck!