Thanks for query,
Heart attack may have or may not have any sign.
All typical signs of having severe chest pain
,chest distress,difficulty in breathing,radiating pain
One may not have only gastric upset or shoulde pain with chest distress will have heart attack.
So better keep your blood pressure normal,if diabetes keep under control,
Have your weight normal.
Do regular exercise.
If you have just doubt about attack,consult your doctor.
Do not become your doctor and do self medication
Ok and bye.