Start out on 6 and ramps up to 18 after I’m asleep

I have a Phillips Dreamstation 2 and I have a full face mask because I am a “mouth breather”. I am on only blood pressure meds which I’ve taken for years.

Only been using for the 3rd night. Major problem with air pocket forming in what I think is my esophagus. Once machine reaches higher settings, I’m waking up having to belch/burp out, excess sir pocket, every other breath. Driving me crazy and keeping me from being deep asleep. Are others having thi...