It could be so many things from a virus to pancreatitis.
If he can't hold down food, I'd be a bit concerned about his pancreas personally. Did he get anything unusual to eat on Friday?
Have you been told to give something to keep his sugar up?
If his gums are pink and the vet thinks he is fine, you may just want to wait and watch. Do what you have to do to not let him dehydrate. You may want to give PediaLyte.
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