Some practical tips for all of those posting on this thread about aerophagia---the air in tummy leads to gas problem.
In addition to Gas-X and the like, you might want to google GERD. The self-help guidelines for managing GERD often help bring some relief to CPAPers with aerophagia. In particular, you might try eating light suppers, watch what you eat at supper, and not eat for several hours before bedtime. There does seem to be a correlation between OSA sufferers with GERD and OSA sufferers with aerophagia. So when you read through the symptoms of GERD, if they sound familiar, you might want to get tested for GERD.
You also need to make sure that your leaks are under control and in particular that you are not leaking through your mouth. If excess air gets into your mouth, there's a tendency to swallow it.
Finally you might try teaching yourself to fall asleep with your tongue touching the roof of your mouth and the back of your front teeth. When the tongue is in this position, it tends to help keep the CPAP air out of the mouth and inside the upper airway where it belongs.
Finally, if all else fails, bring the issue up with your sleep doctor---particularly if you think you are coming close to simply abandoning CPAP because of the aerophagia: Some people with aerophagia do better on a bi-level machine than they do on straight CPAP or APAP. But switching to a bilevel requires a prescription, a new titration study, and likely a letter of medical necessity sent to the insurance company if you want them to pay for any of it.
current settings Min EPAP = 4, Max IPAP = 8 and Rise time = 3
8/1/2010 sleep study results:
AHI = 3.9 [AHI = (#OA +#CA + #H w/desat) per hour]
RDI = 23.4 [RDI = (#OA +CA + #H w/desat + #H w/arousal) per hour]
Dx: Moderate OSA