I experienced total 100% blockage of a main artery, resulting in cardiac arrest while in the ER and while actually talking to the doctor and describing the symptoms to him. While unconscious and dead, I had the sensation of being in a car hurling down the road, out of control, unable to stop and unable to move. It felt like my arms were pinned at my sides and I could not move or otherwise stop or slow down the car. All around me was white. There were no trees, houses or people, just nothingness. I wasn't passing anything and there wasn't anything to pass. It was just white all around me. It was like I was hurling forward out of control on a vast road that had no boundaries on either side. There was no other traffic; there was nothing else but me and the only sensation was the hurling forward. And then suddenly I was awake and I was looking up at my wife and I said that I thought I had passed out. (I thought I had had some sort of weird dream.) She told me that I had died in the ER, my heart had stopped, and that the doctor had brought me back.
I was not a religious person, but this experience opened my eyes to a world of possibilities. Later, when I returned to the emergency room to thank those who had saved my life, I felt like a ghost returning to the scene of his death. They did a write-up of the event in the local hospital newsletter and I felt sort of like one who was reading his own obituary. Now I know there is much about this world that I do not understand; there are answers far beyond my ability to even fathom the questions.