Hello and thank you for your question,
I am very sorry to hear you are suffering with this condition. What you are experiencing is a condition called Post-herpetic neuralgia which is a common condition following a shingles outbreak.
At this point taking anti-viral medications will not do any good. Anti-viral medications are only good within the first 48 hours of onset of shingles. At this point the focus should on controlling your pain which, unfortunately, is very difficult to control due to the fact that it is nerve pain.
You are taking the right two medications (Gabapentin and Cymbalta). Your other option would be to switch from Gabapentin to Lyrica which is somewhat easier to dose. Also, pain medications such as Vicodin or Tramadol are often used in post-herpetic neuralgia. These 2 medications are narcotics but, unfortunately, there is nothing else on the market which is specifically targeted for this condition (besides Gabapentin or Lyrica).
I hope you find this information helpful. Please feel free to follow-up with any other questions you might have.
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Best wishes and good luck,