I've recently started to get stabbing pains on the outer left side of my chest (where the inside of my left arm touches the chest area). It is in the area where the heart is at. Its a quick stabbing pain that comes and goes. The pain last a few seconds and never longer than a minute. The initial pains is gone, but there is a small amount of pain that stays for a few minutes.

I did not feel any numbness following the pain.
My family does not have a history of heart problems.

I first noticed the pain while resting (laying down) after a strenuous work out of weights and running.
The next day it occurred during my work out when I was running. I avoided doing any strenuous, but again it occurred early the next morning while I was taking a deep breath. It was a quick stabbing pain again, but it quickly subsided.

I am doing deep breathing to see if it associated to it, but the pains has not come back.

I was doing a little research and I think it might be due to the following items:
angina
anxiety & stress disorder.

What are a few steps I can take to better self-diagnose the pain?
How would I proceed in talking to a doctor about the pain?
What should I expect from the doctor during diagnosis?