Moderna Vaccine.
The vaccination itself was painless.
I didn't even feel it going in my arm.
First dose only so far.
Sore arm and rash and
Fever (3 degrees above my normal) started within 10 hours.
I woke up with body aches and chills and a moderate headache which lasted most of the day.
By about 36 hours temperature back to my normal but rash still there.
Arm much less sore.
Besides the arm rash (and now very minor arm soreness) I feel 100% back to my normal and felt fine 36 hours after the vaccine.
Greg's only reaction to dose one of Moderna was a sore arm and fatigue for about 2 days.
He had no fever or aches or body chills. Just a moderate fatigue.
I voted the fever choice in your poll as the symptoms went away within 36 hours so I don't consider that to be major side effects.