My DH got his C-PAP first, and a couple of years later, I got mine. My Honey is a "mouth breather," and I'm not. He would open his mouth and I thought I was sleeping with a Leaf Blower!! We found out that they make chin straps...they aren't tight, they just keep his mouth closed...YAY!! No more leaf blower! We both feel better than we have in years. I sleep like a baby and, finally, don't wake up with a headache every morning.
All I can say is that if you are having trouble with adjusting to your machine - Hang in There! It is so worth it! Once you get comfortable with it, you'll regret the years you spent without it!
...and to all a good-night.