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You may have pituitary gland problem called diabets insipidus.
Deficiency of ADH hormone or kidney resistance to ADH results in lot of diluted urine and all the symptoms you are experiencing.Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star).Please bookmark my profile for fast, reliable authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/
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Urine osmolarity, eletrolyte levels should be checked initially --will be low.
Then fluid deprivation test should be ordered.