Remember that Shingles vaccines are only effective for 5-10 years. In fact, the earlier versions (over 5-7 years ago - live vaccine) are only effective about 5 years. My sister and I had the live vaccine those 5-6 years ago, and she had a small, mild bout of shingles this year. Doctors said the old vaccine was wearing out, not that effective. Newer vaccines are better. Wife and I have now had our new vaccine shots in Nov., and due for booster in Jan.
Talk to your doctor, get the vaccine or even re-do it again. My sister's case was mild, probably because the old vaccine was still helping a little bit.