I got my booster shot yesterday cause apparently im supposed to get it in my teens and im 15 right now so im like why not ive gotten shots before and its not scary at all. so i get my shot and i have to stay in the hospital for 15 minutes incase of dangerous side effects. after i left home and woke to find my arm slightly bigger and swollen and my arm randomly twitches. though the doctor said its normal, but feeling ur arm twitch isnt normal for me. never happened when i got my flue shot or hepitis shot or meningicocol meningitis.