Son has been vomiting weekly since August. Started initially after new job at fast food place, when he was consuming high volumes of fast food. He quit job, cut back on fast food, but vomiting continues.
Most frequently I observe him eating dinner, and you can see him get a nauseous look on face, face changes color, and he gets up to vomit. Vomiting usually occurs immediately when eating, or shortly thereafter. Very rare is it a long time after he eats. Have seen him get sick from anything from pizza to baked chicken to a smoothie. Vomiting is more frequent with higher fat foods, but not exclusive.
He continues to have pain on left side, and frequent vomiting.
What else could this be? What tests should be done?