I did actually have a panic attack a few hours after getting the flu shot. I think I might have really gotten nauseated from the shot, but then it just developed into anxiety. I thought I was having an actual reaction to the shot but I wasn’t. I was ready to call 911 because I thought I was having trouble breathing, and I was home alone. but then I was able to distract myself with the TV until my mom came home 10 minutes later. I took my Xanax and I was fine after that. I knew yesterday I would have issues though.