thanks for writing to us.
& heaviness of chest may be two important cardiac symptoms. it is good that you do not have a cardiac risk factor but that does not automatically gives you 100% protection, neither presence of these symptoms suggests 100% presence of disease. to elucidate the exact nature of problem you need examination and may be some tests.
i would like you to see your physician and proceed as per his advise.
please feel free to write further after visiting him.