I have been feeling terrible for over a week now. My head spins when I stand up, I am exhausted all of the time except after dinner my heart rate seems to be higher than normal and my vision is blurred sometimes. I was searching the web and one of the causes of dizzyness and the other symptoms is dehydration. No chance of that. In order to counter my general bad habits in staying hydrated in the summer and my dry skin I have been drinking two litres (at least) of water a day. One of the other causes is an electrolyte imbalance. I am pretty sure you can get an electrolyte imbalance by drinking too much... Oops. My symptoms certainly started pretty much the day after I started with the water. I probably havent helped matters by cutting all meat (lots of fish though) out of my diet suddenly.