Oh you poor girl. I feel for you. YES, stress is awful and can trigger the virus. Or, it decreases the immunue system and that triggers..... Regardless, I hear that shingles is incredibly painful and I hope you get over it quick.
I have "only" made it to hives stage (due to stress) and DH had a case of Bell's Palsy. Same virus, different outcome.
Be calm, be relaxed, and be well.