I had my surgery on Monday and when I tried to use my Cpap my stomach started to hurt almost immediately. I think the air was getting into my stomach, I had noticed in the last few weeks before the surgery I would have to take the mask of in the middle of the night to burp. I was thinking I needed to get a new mask as this one has about had it. Does anyone else who uses a cpap have this trouble and were you able to fix it? I was also thinking of loosening the mask so there was not as much air pressure.