[mycena]

From a personal standpoint, I only get headaches in relation to 'exertion'. I pretty much assume mine are related to hydration levels, that includes not only keeping hydrated but makng sure that the body can utilize those fluids as well. That's the whole premise of gatorade. For those who might not know, too much gatorade isn't a good thing. You have to drink lots of water too. etc. etc.

I think the big thing though isn't necessarily what you do the day of the tournament but rather what you do the day before. I think a huge key to being prepared for a tournament is spending the day before the tournament hydrating and eating foods with lots of good nutrients. This way your body is ahead of the game and not trying to play catch-up all day. Oh yeah rest is a good thing too.

Most people i know who get migraines, have them triggered by something specific (often unknown). So, maybe just changing something in your normal tournament routine may actually help. Get less sleep or more. Eat something different for breakfast. meditate mid tournament. whatever!