I think you are looking too pessimistic at the future.
Even without lifestyle changes, 40 and even 60% blockages are normally far from giving troubles.
Reliable checks of the blockages would only be possible with angiograms, which are expensive, not without risks of complications and exposing you to a lot of X-ray radiation.
Heart disease in the family is taken into account only if the family members were well below age of 60 when they got heart disease.
It is good that you changed your lifestyle.
With the changed lifestyle and medication, it is very well possible that the blockages do not progress at all.
Marryzoomer. I just want to say that from my research, following my dad's heart attack, blockages are very common and most of us have them and don't know about them. It's just unfortunate if someone has a heart attack, due to a clot forming, then they get the report on what's going on in their arteries, where most people don't know...yet the same thing is most likely in them.
Dr Esselstyn states that coronary disease can be found even in teenage girls in western countries. It's not usually symptomatic, but it can be there.
So what I'm really saying is, I understand your concerns, but at the same time they don't necessarily mean what you may think. Those blockages may never progress.
It's great that you're making lifestyle changes. I would really recommend the Esselstyn Nutrition Roundtable page on facebook if you want to do something to feel back in control. It's the best resource I've found as it offers practical help. Dr Esselstyn's approach has even been shown to reverse blockages in some small studies. But I'll leave you to read and make up your own mind on it.
I hope you can find a lot to be hopeful for. Of course it's all raw at the moment, remember that the people you saw in the hospital were there because it would have been a cardiac unit. There will be many out in the community that will never have to go back, for the rest of their lives. x