Got my second Pfizer shot 2 days ago, hydrated very well that day and brought a big glass of water to bed with me, woke up in the middle of the night with sweats, sore arm, and a headache. Fell back to sleep and woke up the next morning feeling absolutely horrible, fever, muscle and body achs, cold sweats, swollen joints and mild spinning. Could barely get off the couch, slept in and out over the course of the day with all the symptoms continuing. Went to bed feeling rough to say the least. Woke up in the middle of the night drenched in sweat but feeling better. Got up the next day feeling better with what I would describe as the same feeling id get with a mild hangover after a night of drinking. I most definitely will not be getting another shot 6-12 months from now from pfizer, that I can promise.