Getting 120 oz of fluids in but STILL dehydrated.

I'm getting 120oz of fluids(mostly water)in everyday. I'm getting lightheaded and have dark urine and bladder pain. The dr. says that he thinks that I'm dehydrated and may have stones in my bladder. My question: If I'm getting 120oz of fluids in and I'm not urinating very much, Where is all the liquid going? My surgery was May 8th, 2003. I suffer from the cotton mouth and drylips as well. Before the surgery, a large glass of water meant a trip to the restroom within an hour or two. Now I drink twice as much water/fluids and I might go once a day. I drink gatorade/water mix to help but I still feel dehydrated.

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