Help! What can cause dry mouth and tongue feeling raw and dry? Also roof of mouth is sore?

Side effects. Could be a side effects from certain meds. Like antibiotics, are you on any meds.? Also severe stress causes similar symptoms .
Lots. Such as many meds, certain syndromes, gerd, infected soft tissues, snoring, mouth breathing, narrow palate, and so many other problems. See both your dentist and your physician for examinations to diagnose the cause of your problem and treatment.