Hi thanks for contacting HCM.... As You have mentioned gas as adjoining symptom so chronic constipation also can be there leading chest pain.... But dear first according to this history , ischemic heart disease like angina or MI ruled out by ...... 1.Blood pressure checking 2.EKG 3.ECHO 4.Cardiac enzymes estimation if needed Than if MI there, angiography can be done and if needed angioplasty or thrombolytic therapy done .... For angina sorbitrate like drug given .. If no cardiac cause present than treatment for constipation done by stool laxative ex.dulcolax tablets .... More water taken ... Take care ... Consult physician for this .. Hope I have solved your concern..... Dr.Parth