Dehydrated. Me?

I feel dehydrated. I feel stupid to admit it since I've had over 500 ounces of liquid in the last three days but it's true. How can this be? Is it possible for someone coming off of a juice diet to claim dehydration? Am I absurd? What's with this dry spot in my throat? Am I so used to drinking all day that I'm not used to not drinking all day? Other than this, I feel just fine.