Good question, and I apologize in advance for the TMI nature of my response... but I had a medical procedure performed by a gastroenterologist about 16 hours after my vaccine (it wasn’t a full colonoscopy, but related). I had to start prep for that an hour after I got the vaccine. I might otherwise have staggered these events, but I neither wanted to pass up the chance to get the vaccine before they had to pitch it, or reschedule the procedure. I have previously reacted kind of wonky to a medication trying to move my body along, as the gastro prep one was, but I can’t say what was attributable to the vaccine versus the prep meds. I did have teeth chattering chills about six hours after both, major sweating about ten hours out, dizziness/nausea that next morning, and a dull headache all the next day. All of those things happened when I reacted to similar meds before, and the headache could have been from the dehydrating effects of the prep meds. I came straight home after the procedure and took a big nap. I was feeling much better that evening (24 hours out from the vaccine) and was basically back to normal the following day. I will say my left arm didn’t hurt or feel sore at any point; I’m a left side sleeper and was able to do that without issue.