I have just started awaking with cold sweats,extreme thirst,blocked nasal passages and have developed tingling in the feet at night and at times during the day. The Doctor tested for a number of things plus Diabetes and everything was o-k! He then suggested a trial period drinking plenty of water to combat de-hydration. This period is now over and i am still the same !! Can anyone tell me if there is a test that could diagnose the culprit causing these problems?