Without knowing the specifics of your illness, it does sound like you have severe coronary artery disease, based upon the number of prior coronary interventions that you have had. It's difficult to tell you about other options available to you without knowing your symptoms, medical information, etc.
I recommend obtaining a second opinion from another cardiologist; by bringing along your medical records (including copies of prior catheterization reports/images), they will be able to make a more informed decision to help you best.
In addition to working with your cardiologist I suggest you contact Dr Esselstyn of the Cleveland Clinic. He is not a cardiologist but has worked with quite a few cardiac patients, some very severe cases, and has worked with some of the cardiologists there and elsewhere. He will explain to you how to change you diet to dramatically improve your chances. I had and MI and have stents and have followed the cardiac diet which Dr E developed. So far so good. Ex Pres Clinton follows Dr E's approach as well.
Here is one of his lectures at another Cleveland Hospital:
Intro over at 8 minutes.
One patient with severe cardiac disease talks briefly about his experience after following Dr Esselstyn's advice. This starts at 1h 16 minutes.
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