Does being bloated and gassy cause nausea?

It may or may not, but try to determine what makes you bloated and naseous. Is it lactose or gluten intolerance? Try to find triggers. Taking simethicone 1/2 hour after meals may prevent gas build up. Drinking hot water helps breakdown gas and enables you to pass it down the intestinal tract& out the rectum. Forcing yourself to belch only makes you swallow more air.