I have been riding/racing XC for about 4 years now and after all hard rides and races i get really bad head achs. I drink tons of water before during and after the races. I usually eat correctly the week before the races also. Does anyone else have this problem and does anyone know how to cure this problem. For instance yesterday i drank over a gallon of water in the morning while at work. I then did a 35 mile road ride on my XC bike during the ride i drank 70 oz of water. when i got home drank another 100 oz of water throughout the night. anyone have any ideas???