Thanks for your question on Healthcare Magic.
I can understand your concern.
In children, this kind of
severe headache is commonly seen with infection like
meningitis.
He is also agitated, sleepy and feverish.
All these are common symptoms of meningitis in children.
So in my opinion, you should immediately take your son to pediatrician and get done clinical examination for
neck rigidity, blood reports,
MRI brain and lumber puncture (if required).
He might need intravenous antibiotics, painkiller, fluids and other supportive drugs.
Don't worry, he will be alright with all these but immediately
consult pediatrician.
Hope I have solved your query. I will be happy to help you further. Wishing good health to your son. Thanks.