Welcome to HCM
In a diabetic patient chestpain must always evaluated for anginal pain as you have not described type of pain and relation with exertion and how it is relieved,even it is atypical it is better to go for medical checkup and proper examination and Cardiac work up like ECG,2 D Echo and if required TMT as this can detect ischaemic disease without symptoms also.
My advise is to quit smoking
and take up regular exercise after your medical check up,also check your FBS and PPBS along with Lipid Profile
to know any other risk factor present.
by diet and exercise,and ayurvedic medicine but be aware of content of your drug. if blood sugar level is high take proper anti diabetic drugs / insulin
Good Luck to you