For me headache and nausea especially accompanied with goosebumps means dehydration. I use gatorade because I'll drink more of it than I will water and it replaces more than just the water that got sweated out. On a ride that long I'll go through a whole 70oz camelback and sometimes a bottle or two, depending on the heat, humidity, whether I'm starting out hydrated and how hard I'm working and it sounds like you are working hard.
Last edited by singletrackmind; 07-15-2008 at 05:59 AM.
I used to have an open mind but my brains kept falling out.