My son says he has never felt a headache come on after physical activity (except if he bumps it in the middle of a game---lol---his words not mine!) but he says he feels very thirsty if he has over exherted himself quite often.  I also note that he has a sleep in the afternoons sometimes when he arrives home(even as a nine year old!) when he has had a particularly active day.

He has headaches mostly as a symptom before nausea comes on though which he describes as being at the back and base of his head and at  those times he has felt hot and sweaty on his forehead and he also feels dizzy.  I put that down to him needing extra cortisol and I have given him one double dose and either collected him from school or kept him off to keep an eye on him.  Often, he has recovered after the one double dose and the change was amazing.  So over the years I have always done that now.  If he has still complained after one double dose, I have done it again. 

 

JH