Which brand of vaccine did you get?
HuskerBoard
MLB 51
Decoy73
It could mean your getting a good immune response. Did you do pushups, dips, arm rolls, etc afterwards? Won't prevent the pain, but can help. Too late now, I guess. My number 2 is tomorrow. Pain was there on the first one, but not until the second day and not too bad.
knapplc
I just got Covid like millions of other Americans. It sucks. I'm still hugely fatigued three weeks later.