problems with my cpap

I 've had my cpap for about 2 months. It isn't helping. I'm very tired all day long..I usually can't fuction without 2 naps a day. I had nose pillows then a chin strap, and now a full face mask. They even turned it up a little bit. .I do know my lowest oxygen level was 79%. . I think the sleep center is getting tired of me making so many apt. Any ideas, I just can't figure out what the problem is?

Is there another sleep center you can try for another opinion on your settings? that must be really rough being that tired all day. If they act like they get tired of you maybe they will refer you to another sleep clinic or respiratory specialist. just an idea...

Thanks for the great idea!!!