I m concerned about either diabetes or kidney disease... my symptoms are: frequent urination, excessive thirst, itchy skin, more frequent urination lying down and after taking Tylenol, mild achiness in the kidney area, fatigue, nausea, loss of appetite... family and friends are concerned that its diabetes or kidney disease... also, back in 2002 I was admitted to hospital and was told that I was 24 hours away from renal failure.