Well, 24 hours after Pfizer #2 my only side effect is a sore arm.
I feel a bit tired too but I'm unsure if that's the vaccine or just stress.
All that said, I'd have been fine with feeling sick as a dog in exchange for the protection vaccination offers.
No longer having to worry about getting seriously sick or dying is a dream come true after 18 months of anxiety and OCD trashing my mental health.