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What kind of milk was consumed? How often is this given?Any diarrhea?How is he acting currently?
Milk may settle the stomach with people but cats are typically lactose intolerant in adulthood and this is probably what caused him to want to vomit. Is he still acting nauseated?
In this case, keep an eye out for diarrhea for the same reason. If he was given medication for nausea, this can take a few hours before it is effective. If he's not acting like he wants to vomit now, the medication may be doing its job.