welcome to healthcare magic. Your son's headache could be related to a problem in his eyes.So pl get his eyesight checked first. It could be a migraine
attack, in that case, such kids need to avoid certain products like chocolates. And i prefer, not giving him dispirin, as in kids, at times it leads to certain commplications. So rather than getting a symptomatic treatment, please get him thoroughly evaluated first by a paediatrician, then his eyesight checked, and further if required , a neurologist
. At times, some kids sham illness, when they want to avoid certain things being done like studies.So bear that in mind.But for that all organic causes needs to be ruled out.