From all I've read about Shingles, it comes on from added stress issues. I've learned to keep calm and work with supplements like:

Inositol
Gaba
L Theaine

Which are all calmers and also do meditation on regular basis, short sessions are fine but do them....

I know many take the shingles vaccine, I DO NOT. I'm not big on vaccines unless really necessary. Work on my immune system and believe the Grape Seed Extract I've been taking for 25 yrs soon is keeping me in good shape. It contains anti viral, anti bacterial, anti fungal properties. I'm 81.