Only because our recent experience w/ our 8 y/o: Kidney stones. Although, the pain does sound to be high up and in the front. It could be referred pain.

Or, maybe even Gall Bladder--I'd say talk to pedi, and get a referral to an internal med doctor OR a pedi gastro doctor.

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Mental that one, I'm telling you. ---Ron Weasley, "Harry Potter and the Chamber of Secrets"