Hi Jerry,
Stress is considered a risk factor. Stress is thought to include type A personalities, anxiety disorders, panic disorders, as well as just general stress. It probably stems from increased adrenaline levels among other normal responses to stress. This is an area that is not well studied but certainly is data showing an increased risk.
Family history is generally considered a first degree relative (mother, father, brother, sister) that has a heart attack before age 55 in men and 65 in women. Based on what you wrote above, you do not have family history of heart disease.
If you are worried about heart disease--try to focus on modifiable risk factors. Don't smoke, don't smoke, don't smoke! Watch your weight, exercise, treat any high blood pressure and diabetes aggressively with medication and lifestyle changes and manage your stress the best that you can.
I hope this helps