Hi, For The Past Couple Of Years I Have Been

Hi, for the past couple of years I have been experiencing belching and as of lately it has has worsen. It has worsen that experience belching/heartburn every 5-10 minutes. I been prescribes meds by my primary physicain. no releif. Ihave also diagnosed with sleep apanea and have been using the CPAC machine. The machine has not been calibrated to my specific setting for me beause I am in the beginning stages of the sleep study. I have also noticed that my abdomen to begin increasing in size, could it be trapped air?