Michaela, I'm in a rush at the moment, but I feel so for your sweet ds. While he's most likely clearly under stress at preschool, I'd also just like to add a suggestion to pay close attention to his symptoms, what's happening when etc, and take him in to see the dr. Our dd10 was a happy, healthy kid until she had her MMR combo vaccine at 18 months, she developed a fever within 24 hours, and medical problems that developed soon after that have been a huge part of her life ever since. Joint and stomach pain, incredibly loose stools were among the symptoms. Chances are what's going on with your ds are not related to the MMR, but at the very least there's a chance he has something going on medically that is important to check out.

I hope he's feeling better soon!

polarbear