I am not prone to headaches but occassionally get them when exercising extremely hard
I do remember reading some literature to do with time trials and they seemed to say that it was just a natural consequence of pushing your body to the absolute limit
I had one at the weekend but I do not remember if it went away after a rest, a drink, some more energy drink, proper food, electrolyte tablets or some other factor.
Sorry to not have a positive suggestion but I just thought I'd mention that even for people that are not generally sensitive to headaches, this sometimes happens
I do remember reading some literature to do with time trials and they seemed to say that it was just a natural consequence of pushing your body to the absolute limit
I had one at the weekend but I do not remember if it went away after a rest, a drink, some more energy drink, proper food, electrolyte tablets or some other factor.
Sorry to not have a positive suggestion but I just thought I'd mention that even for people that are not generally sensitive to headaches, this sometimes happens