Severe dry mouth

Had severe dry mouth 10 out of 10 during sleep study. Woke up during the night with My tongue glued to the inside of my mouth! So dry!!! Doc said to increase my humidity level when I got my machine. Soooo, got the machine...same thing-Humidity level at 7. Switched to the mask I used for the sleep study for 2nights. Same thing! I believe I now have mask anxiety! Afraid to use it again...was really hoping this would be my answer.