I was diagnosed with obstructive sleep apnea in 2007 and was prescribed a straight CPAP machine. From the first night I used the CPAP I suffered from excessive gas. Several medical "experts" told me I was swallowing air and I should raise my head or take something for the gas. I changed masks (full-face, partial, nasal prong). I got a heated humidifier. Nothing worked. After further reading I found that it isn't aerophagia but gastric insufflation caused when the CPAP blows air directly into my stomach (I also have a hiatal hernia). Surgery for my apnea is out of the question. I have TMJ so that eliminates an oral appliance. Would changing the type of CPAP work? If so, what should I be looking at?