Did the vet even administer any fluids? He's got to be dehydrated by now. Did the vet show you how to force feed?
I don't know the whole story at what went on at the vets but if that's all that happened, "they told you to give it more time" than I would get a second opinion.
Try force feeding the soup (watered down a bit) that Gail posted with an oral syringe. If he's not eating or drinking much & is getting weak he'll probably need that done every2-4 hours.
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