CPAP means “Continuous Positive Airway Pressure,” which further means that the CPAP machine helps maintain positive, very low and comfortable pressure in the airway of your throat, and keeps the airway open all the time whenever you sleep with it. As long as you wear the CPAP machine during the night while sleeping, the CPAP machine kills most apneas and hypopneas, and keeps your AHI (Apnea Hypopnea Index) perfectly normal. As the airway remains always open, sufficient amount of air passes into the lungs freely, and maintains normal blood oxygen levels (SpO2 = 96% to 99%) all the time during sleep.
You will take appropriate steps to lose weight, and your sleep apnea will be progressively healed. Even some 10 to 20 pounds of weight loss would have a significant impact. The number of sleep apnea events per hour during your sleep would significantly decline, switching you from severe to moderate or from moderate to mild sleep apnea, and allowing you to feel a lot better.