I woke up last night with chest  and upper back pain. It felt like gas but wasn't going away. I turned off the air flow to my CPAP mask and the pain slowly went away. When I put the mask and air back on the pain came back.  I have recently lost 20 pounds. Could it be that the air pressure is too strong and I am filling with air which is causing the pain?  I am completely fine this morning.

Thanks for any thoughts.