How much is too much water??

ok so lately I have been drinking a ridiculous amount of water. I am constantly thirsty and no matter how much I drink I don't feel not-thirsty. Because of drinking so much I am peeing like crazy but (probably TMI but here goes) my pee is never clear. Today I have drunk about 5-6 litres of water spread out through the day, 2 cups coffee and a can of diet coke. I know it can be dangerous to drink too much and I have a history of dehydration so I'm pretty aware. Anyone got any idea why this could be? It's been going on for about 3-4 weeks and seems to be getting worse :s

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