@kittykelly1234 @johnbishop
Well I too have the ResMed AirFit F20 Mask. I have to have a full Face mask. I actually need the full face mask as I mostly cant breathe at all out of my nostrils so I am a mouth breather so I cant use the nostril masks.

Its not an issue with getting used to it. As I stated I had previously used the machine fine every night for almost a year and a half. Then all of a sudden when I use the mask its like I am just rebreathing air/Co2 over and over again, I get out of breathe and light headed. As far as I can tell all the exhaust ports on the mask coupling are clear. The Cpap get a new filter monthly.

I dont get out of breath or feel like im suffocating without the Cpap machine, its this feeling like I cant breathe that triggers the anxiety attacks. My pressure is already pretty high at 20 so I dont think I could go any higher comfortably.

As I mentioned I did put in another call to my Respirologist so I am going to see his opinion of what he thinks might be causing this as it might be physical and not the Cpap machine.