Need to see pain doc. There are some over the counter topical treatments like capsaicin, lidocaine, Benzocaine that can be helpful. It is best that you see a pain specialist to go over more options. The more aggressively your shingles are treated the less likely you will wind up with postherpetic neuralgia - an often unrelenting, painful condition.
Best treatment is. Oral antiviral meds: shorten course of infection & help prevent nerve pain of untreated shingles. Topical creams containing capsaicin may provide some relief from pain, but this hot-pepper derivative may "burn" or irritate the skin of some people (& should be used with caution to prevent getting in eyes). Topical preps with Benzocaine may help.