I hope this problem clears up for your, however if it were me I'd still seek a second opinion.
Incidentally what tests did your vet run? I'm thinking that tests for parvo, giardia, coccidia, and pancreatitis might be called for if all the 'usual' tests came up negative. He may need retesting, whatever was going on then may have returned anyways.
It sure seems to be a strange problem. Please try to get a second opinon for the sake of you furbaby.
Keep us updated.
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