Hi
headache along with fever-spike is not as dangerous, but still requires early review.
Headache relieved with vomiting, persistent vomiting, altered behaviour, irritability, drowsiness, neck pain, ....all requires urgent review, as can be suggestive of brain fever or serious systemic infection.
Next Steps
please understand that medications can't be prescribed without reaching a diagnosis: fever with headache isn't a diagnosis.
please consult your local Pediatrician for reaching diagnosis!!
Health Tips
For symptomatic relief of headache, oral Paracetamol 10mg/kg/dose every 6 hours can be given them to still till Dr's review.