S.A.
This recent bout of stomach pain and vomiting could be a stomach bug. But if he generally doesn't eat much and is losing weight, he should be given a proper work-up. I would seek out a new pediatrician. If he's been making himself gag and vomit, and hasn't been eating well since he was a toddler, this is not just a phase...Go with your mother's instinct and be his advocate! Best wishes!