Thank you for your question,
Based on your history, age and presence of negative echocardiogram
puts you at low risk of heart disease.
One thing that can rule out possible heart disease is stress
exercise test or stress echocardiogram.
Combined these tests have accuracy of more than 90% to rule out ischemic heart disease
So this can be planned if you have symptoms of atypical angina
I hope this helps.
Let me know if you have more questions.