Thanks for writing us..
If you had 2 proven attacks of MI( either ECG, ECHO or Blood test
proven) and angiogram showing insignificant disease then presently you should continue some drugs without any interruption under care of your doctor like antiplatelet, statin, beta blocker
and others according to your heart function and B.p response..
lasting for less than half minute is usually not due to angina but sometimes arrhythmia mimic this pain..
For this consult cardiologist
and take medicines regularly.
Best wishes for good health