Thank you for your question.
I am Dr. Su S. and I will try my best to help you.
As he does not have sore throat or cold symptoms, you can give Motrin or Tylenol.
He does not have rigid or sore neck, it is unlikely to be meningitis.
Sometimes in headache there can be intolerance to light.
But if it persists, you should take him to doctor for an examination.
Rest, more fluid to be continued.
In viral fever
adequate rest, proper hydration are important.
I hope this information will be helpful.
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Wish his healthy life.