I suffered a traumatic brain injury as a pedestrian who didn't look both ways. My answer isn't very fun but I technically qualify as I had to be resuscitated on scene.

I was in a coma for a few days and then--despite being conscious and over time regaining awareness, then vocalization, then even conversational speech--I wasn't writing any new long term memories for a couple of months. My experience of that dark period, to the extent that it isn't nothing, is pretty vague. The memories of months preceding injury are pretty blurry until the injury which I don't remember and then the next I remember is being tied to a hospital bed and chewing on the Posey mitts. I remember some hallucinating in that period, one instance is an ordinary piece of a day interacting with nurses and therapists but perceiving everything as if drawn in the Family Guy cartoon. I post-hoc interpret that memory as a vague basically dream state that got mashed in with a Family Guy memory.

So no, no afterlife experience or memories of the other side.