Hi, Did the doc check to see how your kidneys are functioning? With these symptoms, they automatically check for diabetes. If this comes out negative, they then start checking other things, such as kidneys which is also done by blood test. I recommend seeing an internal med. doc as they specialize in diagnosing and treating things like this. I have a relative who is female, with exact same symptoms for years, and bladder infections occasionally for no particular reason, had many tests, all came back negative. She was thirsty nonstop, even woke in middle of night thirsty, and going to the bathroom about 3 times a night. She finally went to an internal med. doc because she was tired of it and wanted an answer. This doc said she is pre-diabetic, something that did not even occur to any of the other docs. This was only after she developed another symptom, which is pins and needles in both feet so much so that it kept her up at night. She was put on a particular diet, because this type of diabetis is caused by the persons diet. So if you are able to, see an internal med. doc since they specialize in spotting the cause and treating it. Good luck to you