My stomach hurts. A lot.

I was at baseball practice (I'm a girl who plays on a boys team. No one can stop me.) and some of the boy's were swearing. So my coach made everybody do two-three laps around the field. NOT the bases. Then we had to do 100 sit ups. I'm not exaggerating in the slightest. Now my stomach has been hurting a lot. This happened on Monday. What should I do to ease the pain. I know I didn't have to make the post so long, but I did so oh well.