What happens in the brain to cause dry tongue but not dry mouth? is it from a combination of medications or their withdrawal out of my system?

A dry tongue: can be caused by a number of things, including dehydration, medications and various other medical conditions and diseases. I can appreciate your concerned about your health, but finding a proper diagnosis and treatment may be the answer to your worries. Rec.: see your dentist for examination, diagnosis or referral to oarl medicine specialist.