I have never had quite the same sort of experience as you. However, things did seem to go in slow motion once when I was involved in a motorcylcing accident. This was a good fifty years ago.
After being struck by a car, my big 700cc Royal Enfield motorbike went sailing up into the air. The car, coming from the right, had just clipped the rear wheel as I'd tried to accellerate to beat its hitting me. Whilst that bike was it the air, turning over towards me with me underneath it, everything seemed to go into slow motion. What probably took no more than two or three seconds seemed to be much, much longer.
I'm thinking, "That 440 pounds of bike is going to land on me," for it was above me in mid-air. Up it went slowly, down it came just as slowly - and then it missed me! The next moment I'm lying flat on my back on the road, frightened to move in case I'd broken something.
As it was, I got off with minor injuries, though I still have a small piece of blue-metal from the road, lodged under the skin of my right elbow.
It's said that the tremendous rush of adrenaline during an emergency of this sort causes this 'slowing down' effect. But with you it seems to be caused by something quite different.