If your son's vomiting has continue to be severe and he has been unable to hold anything down -- he is in danger of dehydration.
What is more, the presence of headache indicates that the cause could be something serious -- for example, spinal meningitis.
For these reasons, I believe taking your son to the hospital (ER) for examination would be warranted.
My apologies for not seen in responding to your question sooner.
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Let me know if you need more input. If not, thanks for the opportunity to assist you... Please honor my efforts by Clicking the green 'Accept' button (located within this post -- above-right). Adding a bonus -- should you wish to do so -- would be warmly welcomed.
Good Luck!
Steve
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