I am running three or more miles everyday for the past six years. I just started receving heart pain like someone on top of me. What should I do?

Heart pain. Stop the running. Report this pain immediately to your doctor and check check up. This may or may not be related to your heart and only your doctor can help you figure it out.
Be seen. Any "heart pain" should at least warrant being seen by your physician. You may need to be seen by a cardiologist as well.
Dangerous. Please stop running and seek medical atention asap. Chest pain related with exercise could be related with the obstruction of a coronary artery on your heart, so you need to rule out that first, i will recommend you to see your primary care physician first.