Hello, The majority of death due to heart attack happens in the first few hours, so if you have survived that period, you have passed that phase - so no acute harm will do that, but because your heart muscles has been replaced by scar - there is possibility of your heart in functioning less and may be difficult to do your daily activity in future. So survival period is as long as a normal person, unless you get another heart attack. With your lifestyle changes and medication and some precaution to prevent further attack - you can enjoy your life. Belief in God is of utmost importance - keep doing that.