Welcome to HCM,
With your symptoms there is strong possibility of that this is Angina Pectoris
. Please visit your Cardiologist and get EKG done and then future course of action depends on result if abnormal treatment can be started and further testing is done with complete blood test
like FBS,PPBS,BUN,and Lipid profile
along with X ray chest and Echocardiography
and coronary Angiography
If your EKG is normal then you should go for a Tread mill test to know status of coronary arteries and evidence of reversible myocardial Ischemia
You should quit smoking otherwise also due to other risks.
If cardiac cause is not detected then Acid Peptic Disorder with reflux is other possibility.
Please take care.