amielynn38- for the future (not a solution to your immediate problem), consider taekwondo. DS was in preK when he started and is now nearly eight. It helps with bullying by teaching kids how to appropriately stand up for themselves.
I think it helps DS (he has a bully at school right now too) know that he doesn't need to be physically afraid. The words hurt too, but it's awful to feel physically fearful.
Bullying is sure rear it's head again-- and can feel just as bad (or worse) later than it does now.
Also, I wanted to mention that DS did/does beautifully around younger kids. I know people get concerned about academics, but I wouldn't sweat that too much in preK, when you can easily cover the bases at home. DS loved (still loves) the sillier games that younger kids play, and he likes to "help" which he can do when he's playing with someone younger.
