Gas-X won't help, as you do not have gas. You are swallowing air (called aerophagia), which is pretty common when first starting cpap.
Go to YouTube and search for "lanky lefty". He is a sleep tech, and has posted a number of very informative videos. One of them is about aerophagia, and he gives a few tips about how to deal with it. Hopefully, you will find it helpful.
That bloated feeling is very uncomfortable, but it will pass as you get used to the cpap.
Resmed Vpap Adapt SV Enhanced, Respironics Fit Life total face mask, Forma full face mask.
Complex apnea, original AHI 80