Most people aren't aware that laying on their right side can cause gas
to build up in your colon and form a gas
bubble. The way the colon is shaped and with the gas
rising upward, when laying on the right side it gets trapped in the ascending and transverse sections of the colon and is not as easily expelled as it is when laying on the left side.
I recommend trying some OTC treatments like beano, gas X, prilosec, prevacid, Mylanta, mylox etc. for a few days.