Thanks Connie for replying....that's why I posted my question because it is complicated. I am not getting any answers one way or another from physicians. The only link they have is depression and anxiety but they have not done studies on anxiety or untreated sleep apnea.
You may wish to search Complex Sleep Apnea or Central Apnea. These two occur in the brain but also can result from the CPAP pressure. When CPAP pressure is not the reason for the central apnea then the brain tells the lungs to stop breathing. With Complex Sleep Apnea people on CPAP do not get any better with treatment.
those are pretty complicated questions, you should ask your doctor about it. from what i know of CPAP it just keeps the airways open by putting pressure against them, and it doesn't do anything to your brain. The fact that you breathe faster or slower while using CPAP doesn't imply that you have something in your brain, not to say that you don't have something wrong, but your symptoms aren't suggesting it...