The PA that gave me Valacyclovir at 6 months also said it was far too late for it to work but she thought it was worth a try. All I know is I got better a week later. If I ever get shingles again I will be on the health portal requesting a prescription for that drug asap.
The original Zostavax vaccine was a live virus. If given to somebody that never had chickenpox it could end up causing them to get shingles when they were otherwise not at risk. I didn't learn any of that until after my bad 6 month experience with the affliction. Doctors tend to push vaccines when in this case they should have verified you had chickenpox before administering the Zostavax vaccine. Zostavax is no longer available for use in the United States, as of November 18, 2020.
I went ahead and got the Shingrix vaccine when it came out.
I haven't had a flu shot in twenty years or better. They say it can't happen but the last time I got a flu shot I came down with the flu soon after and it lasted two weeks.