I'm not sure if it's heartburn but I'm assuming? My ENT has me taking omeprazole 20 mg once a day. My only symptoms are sharp pains in my chest that occur after eating and when lying down along with gas (belching) frequently after meals, I've also been experience some shortness of breath when lying on my back. I don't have the "burning" sensation that others experience which is what confuses me. I have had a barium swallow and all looked normal, they ruled out a hernia. I'm just not sure what else could be causing the pain if not heartburn (and all "heart" tests have come back fine).