What Causes Headache In Children?

My son aged 9 years and weight 41kg started complaining of headache(forehead) since yesterday. He also developed fever which went upto 103 degree fahrenheit. Besides vomitting 6-7 times had also incurred. Consulted local doctor who has adviced for oflomaxin 200 mg(BD), Pan20 tab before breakfast, Calpol for high fever. After, vommitting to some extent headache subsides but it continue to recurr with unbearable pain in his forehead. While sitting and walking giddiness is also being complained. Stiffness of neck is also ruled out. Please advice