First confirm that your blood sugar and blood pressure is under control, heart rate is regular. Then do an ECG. See if you have breathlessness. If you have constant anginal chest pain, Ramipril, a bets blocker such as Meyoprolol in slowly incremental doses. But you should consult a cardiolgist urgently in this regard.
MBBS, MD - Internal Medicine, DM - Cardiology, Fellowship in EP
Angioplasty is a life saving treatment if done immediately in heart attack which has ST line rise in ECG. Angioplasty is more effective than injections for this condition. Please post ECG for final opinion.
There is no chance of you getting a heart attack just like that. If you lead a healthy lifestyle, there can be no dangers. I recommend that you eat healthy, sleep well, exercise regularly and be emotionally balanced all the time. You may also read the book, "Reversing the Heart Disease" by Dr. Dean Ornish and follow his guidelines you will be just fine.