I just had to get two shots a couple of weeks ago, and my arm was sore for about two days afterward too, and people would accidently hit them when I was in a crowded hallway at school. It really sucked. Dx
My school is super big, so theres tons of people, the schools have been asking for more money (to build another High School), and it's ridiculous because they already rip us off enough, I could go into detail, but I'll stop myself. lol.