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He could have had a hairball. He could have had an acute pancreatitis flare-up from something he ate or something in his environment. It could be literally anything in between those two. The vet may not even be able to tell you why he got sick. But he can run some tests to tell you if he’s getting better or at risk to get sick again. With symptoms as vague as those, no-one, not even another vet, could tell you what’s going on with him without physically examining him and taking blood and urine at a minimum. It’s distressing that he got sick but it will be a relief to know it was nothing serious or to catch something before it becomes serious.