According to your history of thinking you have fear of heart attack .
Heart attack is generally not occur by only thinking of heart attack .
If you do think so much and take stress and Anxiety for long time then it can increase the risk of any disease like
diabetes and hypertension and these disease can increase the risk of heart attack but it generally take year to develop any heart disease.
If you have no any risk factor like smoking , obesity , any chronic disease in the vital organ like
Liver,
Kidney and lung and no Diabetes
And do exercise regularly with yoga and meditation then you will not get any heart attack.
Next Steps
Please follow good life style as take plenty of fluid and take less spicy and fatty foods and do exercise regularly with yoga and meditation to decrease stress and tension,
Health Tips
You should keep positive attitude to fight any disease and any problem of your life.