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Thank you for your question.
It sounds like a persisting stomach virus or postviral symptoms that are lingering on more than usual.
Another possibility is that this could be due to some reflux of food and acid into the esophagus or the food pipe that is causing the persistent vomiting.
I would recommend that he should be given OTC dramamine syrup if that is available along with zantac syrup.
If his symptoms persist in the next couple of days then he must be seen.