When my grandmother died she had been proclaimed clinically dead once already about a day before but the doctors brought her back.
Talking to her after she was brought back was like talking to someone from a different world. She was talking about people she had spoken to recently - who were dead. She told my aunt how she, my grandmother, had spoken to my aunts mother. And my aunts mother was dead and they had never spoken much before because my grandmother didn't speak english and my aunt's mother didn't speak spanish. So when my aunt told me these things I was very touched by it.
It seemed so surreal. My grandmother would never fake this sort of thing and I don't think it really was a result of medication.
We really don't know what is after. I wish I knew for sure. But if this story, which really happened, proves anything is that there must be something.