8 glasses of water good or bad?

8 glasses of water good or bad?

Recently my colleagues and i decided to take on a challenge of drinking 8 glasses of water(approximately 2.4litres) per day. This all started by a simple statement made by myself that its childs play and not difficult at all. Thursday 5th december 2013 our challenge commenced but good grief was a task set way to high. 8 hours for 8 glasses, 5 hours in to the day and i was only at 3. My body started reacting really strange to this intake of water, by the 5th glass i could feel my nasal cavities starting to close up. I was experiencing a full on sinus attack, stomach started feeling uncomfortable and bladder just could not process the intake of water quick enough. By the end of the day i completed my 8 glasses of water but felt like i had none, migrane hit me as i got home and for the rest of the night just felt completely dry.

So my question is :
"Is glasses of water a good or a bad thing?"
"Was my body just not use to this massive intake of water and start act up?"