Got the sequel shot last Friday (Pfizer). Worse than the original, where I felt absolutely nothing. The 2nd shot’s effects came on about 24 hours after the fact. Soreness around the arm and ribs on the side where I got it, slight chills came on and a dull headache which eventually turned into a migraine. I have a history of migraines though so I was worried that would happen. I refrained from using any acetaminophen until about 140am because The last time I tried to ride out a headache with no meds it went on for like 3 days. Fuck that. Took a shot of NyQuil (yuck) and got some sleep. Woke up feeling fine. Don’t take acetaminophen if you don’t have to though, as you’ll get a better anti-viral response apparently.