you have a low probability of heart disease. and your chest discomfort is very atypical. its important to know if you have any risk factors like diabetes, hypertension, smoking, family history of cardiac disease or deranged cholesterol levels. If you have any one of these then you have to be investigated furthur that is stress test( treadmill test) you should also know what is typical chest discomfort indicative of heart disease. 1. mostly central chest pain( not left sided) 2. increased on exertion, walking, climbing stairs and relieved on taking rest 3. it usally last for 15-20 mins.. cardiac pain does not occur for seconds or hours