formal items in navy blue

Well I dont really understand how I could have been dehydrated. I think I drink a fair amount of water. And why would I have tingling in my left arm and only a left sided headache? Seriously. I do feel better than I have for a long there's that. But they gave me two intravenous medicines; 1 for headache, 1 for nausea. They said my electrolytes were fine and everything else was good. So how could I have been dehydrated?? formal items in navy blue