So, I got the second Shingrix shot yesterday (shingles). The first one made me feel bad day and a half. This one taken at noon was fine until I went to bed around 10 PM. I started shivering uncontrollably, I had to put a pen between my teeth. The wife covered me up with blankets and I finally took Tylenol. Then I woke at 3 AM feeling gnarly but nor shivering. I almost got the flu shot yesterday as well, the wife talked me out of that.
This is a dead virus vaccine but apparently a minority react fairly badly. I'm "OK", and it's better than getting shingles, but that was not much fun for a while.