I had nerve block injections in the nerves that had the PHN. No drugs ever worked for me and I suffer from Chronic Shingles Outbreaks. I had 9 outbreaks in 3 years before Mayo’s Infectous Disease department put me on a daily regimen of 1600 mgs of Acyclovir when I was 30 years old. I had 3 Spinal Band breakouts before they repeatedly started attacking my 5th nerve and occipital nerve. I am too young for the vaccination although Mayo did help develop the vaccination & applied for an exception to my age; we weren’t successful. But I know how overwhelming PHN is, especially in the location you & I have experienced.