Can Botox injections help with itching after a shingles?

I got the shingles in Sept. of 2013 . I do not have residual pain, but have severe itchting along the nerve that runs from my eyebrow back to the crown of my head. I have seen numerous doctors, I ing. I have even tried acupuncture and nothing is stopping this excruciating itch. It does not subside or go into remission. I itch everyday! Needless to say this is taking an emotional toll and I can't sleep, in spite of prescriptions, topical lotions and creams. I don't know where to turn.