When you say "darkness in my eyes", do you mean you were feeling like you were going to pass out (be rendered unconscious)? Was your vision going dark?
From my own experience I know that your heart feeling like it stopped could be:
a) the compensatory pause after a PVC,
b) a rapid but faint heart flutter that compared to your normal rhythm, feels like your heart stopped, or
c) that your heart really has briefly stopped - I don't know enough about this to know what could be causing it. If you are in extremely good shape (though your previous MI might indicate otherwise), you could have a very slow, natural heart rate which might partially explain a 2-3 second pause.
Sometimes the panic that grips me during one of these events can have me feeling like I want to vomit shortly afterward. But so far, I have yet to feel like I was losing consciousness or getting dizzy or light-headed.
If the pause and your symptoms were caught during your tests and your doctor assures you they are benign, then you might be well served believing him/her. If they weren't, then you should endeavor to have enough tests in order to capture this event and have it diagnosed.
Good luck!
I had a event of a missed heart beat for 2.6 seconds on my Monitor at the first part of Jan. When this happened I was asleep, so I have no idea if I felt it.
It was a 48 hour test and it only happened once.