Field report on my experience with the second Shingrix vaccine, yesterday. Very little pain at the shot. About 10 hours later, I began having chills. All my strength was gone. Went to bed. Had a fever all night. Every hour or so, I had to get up and empty the bladder. Each time after going poddy, I fell back to sleep right away. This went on for 13 hours. I never sleep 13 hours. Woke up at 10:15 AM with a massive caffeine withdrawal headache. That was easily fixed. I am OK, now. Today will be a low activity day.
First Shingrix shot had flu symptons but nothing this bad.
I believe it is still worth it, but just letting you know. Maybe you are not a weakling, like me.