I am feeling zoned out, tired and very thirsty despite a lot of water. I have been tested for electroylte imbalance (a tiny bit low in sodium, but nothing major) and my kidney function is normal. I have never been borderline for diabetes and have no family history in this respect. I do have PKD, which up till now has been asymptomatic, and undertstand that I have several liver cysts. But, as I say, my creatinine levels are normal. I am rather worried.