thanks for writing to us.
An oxygen saturation which is normal or near normal does not mean that you will not feel breathless. it is the effort, which you have to exert to maintain that saturation, which decides how breathless you will feel. Home oxygen therapy
and BiPAP are one of the few interventions which prolong life. Please continue with them. if you continue to feel breathless , please consult you pulmonlogist. There can be other possible contributors to your breathlessness like diabetic and hypertensive heart disease
which can only be assessed by your physician.