I have been experiencing bloating and chronic belching over the past months. i hear the sound of gases in my stomach and pressure in my flanks. of late i feel severe back and flank pains radiating up when i sneeze. possible causes pls?

Don't force yourself to belch as it only leads to air swallowing & becomes a vicious cycle. Gas is properly passed down & out the rectum. Avoid gassy foods & gassy beverages. Drinking hot water breaks down gas. Taking simethicone 1/2 hour after a meal prevents gas buildup. Determine if you have lactose intolerance caused by dairy products or gluten intolerance from wheat products.