I have minimal coronary heart disease in one vessel or two. what is my risk for a heart attack and how high is it ?

Depends on more: factors than just a diagnoses of "minimal CA. " to calculate your risk of a heart attack, you should see a cardiologist at least once every 2 years since your young. But if you exercise regularly (45 mins 5 days a week) watch your calories, normalize your weight for your height and eat a healthy diet you will decrease your chances SIGNIFICANTLY no matter what your risk is at this time.

Intermediate: At your age of 36, it is young to have CAD, but it depends on the test used to diagnose it - CT scan or Coronary CT etc. CAD is a progressive disease, unless significant lifestyle modifications are made at an early age. I would recommend lifestyle changes in diet and exercise and also regular evaluation for this to consider a statin or aspirin sooner rather than later.