I don't know why you're posting here rather than taking him to the doctor. What are you waiting for? Seriously . . . today!

I got stomach pain when I was a kid (older, but still young) as a sign of anxiety, and that isn't uncommon. But before you assume that, please, please go to the doctor. if its something serious, you need to get on it.

We're going through a similar thing. Three times in the past week my son has gotten terrible stomach pains about an hour or two after lunch (no other meal) and it makes him throw up a little bit. He is then fine afterwards. No change in energy, no change in eating habits, no fever. We go in for blood work tomorrow to see if anything is there. We're not finding a physical cause (yet?) so we're stuck wondering if he is stressed out about school.