If you experience belching, bloating, or burning sensation, it’s probably indigestion and gastric problems. But if you’re going through heart palpitation, discomfort in the left side or centre of the chest, cold sweat, shortness of breath, pain in the jaw, neck, shoulder, arm, or stomach, unexplained anxiety, or fast heartbeat, it might be a heart attack. These are the main difference between gas pain and heart attack.