What Causes Difficulty In Burping With Abdominal Heaviness?

i had been taking pentocid from last 1 months, but doesnt get affected to much. I had visited gystrologist because of stomach issues, they said that u have problem of gas and acidity and recommend me pentocid. My gas problem is still on. plz tell wat to do now. main problem is belch, i am unable to belch, it got stuck in my stomach and dont come out from my mouth, bcz of that all the time my stomach feels heavy and unable to eat food although i feel hungry.