Dry Throat All the Time…what is It?

I have very dry throat everyday. I drink plenty of water, so that isn't the problem. A friend suggested that I might have diabetes so I had exams to check my sugar level and it was all normal. I wake up a lot during the night and my throat is so dry, it hurts to swallow. The only way I can fall asleep again is with strong fresh mints. Do you have any clue of what might possibly be? Thanks a lot

Suggestion:

research Candida