This is Dr. David
sounds like there is a lot of gas going on.
I am a cancer doctor.
medications like GasX with simethicone can help decrease gas output.
also changing out the colostomy bag more frequently can help
avoiding sodas and carbonation and beans in the diet can help decrease gas output.
also eating more yogurt or probiotics in your diet can help introduce good bacteria in your bowels to help with better digestion.
also avoiding milk if you are lactose intolerant can help decrease gas.
let me know if you have other questions.