Hi.
Sorry to hear about your bloating. It must be bothering you enough to ask about an oral device.
I tried an oral device 20 years ago and stopped after some months. I think it started to become uncomfortable over time. I'm not sure if they have improved since then. It is supposed to move your lower jaw and tongue forward and prevent obstruction of your airway.
I was thinking of trying one again if my recent sleep study showed no changes in my OSA. (I have lost 10% of my body weight the last 2 years and have a normal BMI now)
Fortunately the results show my OSA as borderline now and the sleep specialist said using a device would be optional. So, unless symptoms or my weight return, I will not be using anything.
My SA was moderate when I started using a CPAP machine 20+ years ago. I feel the levels were too high for me and I was swallowing air. I developed an epigastric hernia and I think it was related to the aerophagia. It is during that time I tried an oral device and then a Bipap machine.
I stopped for some time and started 3 years ago with an Auto CPAP machine which was much better than the older machines, but I still swallowed air. They kept lowering my levels and I ended up trying an Auto Bipap machine.
Not sure if you have tried these newer machines.
Let me know if you have any questions.