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.
The 2 best medicines given during angina are sublingual nitrates and oral aspirin. But they are given to prevent progress of attack and not treat. Best is to go to a hospital immediately without wasting time.
MBBS, MD - Internal Medicine, DM - Cardiology, Fellowship in EP
Minor discomforts are common, don't be scared by them. If you worry that you may develop heart trouble, there is a sensible way to prevent it. Talk to people who are healthy at ninety about their diet. Then you will find the correct way. Best wishes.
You need to focus on your diet first with the treatment. Then only treatment will work. Second is life style modification. Diet and exercise is the only key to stay healthy with the treatment of heart.