Hey stewart,

im not sure what maybe causing that and I have not presonally experienced that myself but maybe your not getting proper sleep? Could be long hours infront of the computer or listening to loud music? Are you eating mostly foods that have sugar? I have headaches all the time because I sleep...A lot. If any of these suggestions are a daily thing in your life, maybe you should make yourself sleep alittle more, not listen to your music as loud or eat better food, also make sure your hydrated drink water! I hope this helps you.. Headaches suck!
<3 kelly