Hi thanks for contacting HCM.... You have dull chest pain and history of drug intake .... So here you could have drug induced gastritis ..... But as you are having family history of heart problem investigate your case with measuring blood pressure and EKG .... If no cardiac cause present treat gastritis by omeprazole capsule on empty stomach before meal .... Avoid excess spicy foods and drink more water ..... If no cause is evident after throught investigation than it could be muscular strain dull pain.... Take care .. Advise : pulmonologist consultation ..