I'm so thirsty!

Aby
I'm really thirsty, usually my day would consist of coffee, glass of oj or milk and then 2-3 glasses of Arizona ice tea! I'm trying to be healthier as I am tcc so I'm drinking my usual plus 3-4 cups of water and nothing seems to be quenching my thirst! What could be chasing this and how can I over Come it!?