I've had this for a while. I need to drink a lot of water or i get dehydrated and i am constantly urinating. Even if i don't drink a lot i still need to urinate often. My doctor surgery has been really unhelpful in the past with my M.E, and they done blood tests in the past for the dehydration and they came back fine. I decided to try again and try and get to see a specialist. I got a new GP and he insisted on doing the blood tests again and again he said they were fine. He tried to blame M.E and wanted me not to take it further but I told him i wanted to see a specialist. I just kept arguing for the specialist and he said he had to ask someone else and he would phone me back, but I'm betting they will refuse. Am i wrong to want this investigated? He said he tested thyroid, diabetes, electrolyte imbalance. Isn't there other things i could get tested for by a specialist?