Veterinary questions? Ask a Vet for Answers ASAP
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What was their diagnostic, after all the tests they performed?
I think based on the information you provided (getting weaker, vomiting, "you think he might die"), my best recommendation is to get back to the vet for reassessment in the next 30 min, as an emergency.
Please make sure that you call them first, but they do have the duty of care and they need to follow this up, probable with further investigations (like ultrasounds), or even referral to an Internal Medicine Specialist (if they're not confident diagnosing the problem and the little one is deteriorating).