Since oxygen is an issue, you might want to look into getting a recording oximeter. They are not very expensive, and the Contec CMS50I is a wrist sensor oximeter that is comfortable and can chart your SpO2 along with your Sleepyhead data.
There is limited optimization that I would be willing to suggest given the complexity of your health situation, and the fact you are under the care of a pulmonologist that has knowledge of your history and capabilities. If you post the Sleepyhead data, we can perhaps offer some talking points to discuss with the doctor.
Apnea Board Moderator
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