I have had extreme dry mouth since the beginning of 2013. My tongue is in pain half the time. I have to tape my mouth shut at night because after breathing through my mouth after an hour of sleep I will wake up with a severe burning mouth. I have eliminated all alcoholic drinks, chocolate, caffeine, acidic foods, salty items, etc from my diet, nothing helps. I take no medications, have no health issues other than this. I get a lot of exercise and am at my ideal weight for my height. I have been to my internal medicine doctor and ENT BUT NEITHER have come up with a solution. I also get canker sores in my mouth all the time and on occasion have acid reflux. I use biotene, chew gum, suck on sugarless mints to relieve dryness. I drink a lot of 7up, rolaids, and alka selzer which seems to help when tongue starts to get pain. Do you have any ideas to cure? I am a 67 year old man.