Pain due to heart problems is usually felt in the chest, although it can be located anywhere between the upper abdomen (upper trunk) and throat, including the arms or shoulders. It can be experienced as discomfort, pressure, gas, or a burning or aching feeling.
Chest pain should ALWAYS be treated as serious, as it could indicate a worsening of your heart failure angina or a heart attack. You should immediately sit or lie down and rest.
If you experience chest discomfort or pain that lasts for more than 15 minutes or is not relieved by rest or glyceryl trinitrate (GTN / nitroglycerin) (if you have been prescribed this by your doctor), then you should call for emergency help immediately.