I have had two stents and I am told my heart is weak

Your ECHO shows evidence of an old myocardial infarct, as well as a significant loss of heart function.
This is of course caused by coronary artery disease, caused by atherosclerosis, caused by cholesterol.
You can read more about this here:
https://www.cardiachealth.org/heart-information/your-cholesterol
https://www.cardiachealth.org/heart-information/atherosclerosis
https://www.cardiachealth.org/heart-information/heart-attack
You are now at risk for more complications:
Heart failure, progression of your coronary artery disease, stent failure and possibly dangerous rhythm problems:
https://www.cardiachealth.org/heart-information/heart-failure
https://www.cardiachealth.org/ca-blog/how-long-does-a-heart-stent-last-
https://www.cardiachealth.org/heart-information/heart-arrhythmia/sudden
Diet, exercise and behavior modification (weight loss, cessation of smoking) and medications is what you can do:
https://www.cardiachealth.org/ca-blog/what-foods-can-help-strengthen-a-
https://www.cardiachealth.org/ca-blog/what-are-the-best-vitamins-and-su
Hope this helps,
Dr T
https://www.cardiachealth.org/