I remember reading a near-death experience of a man who actually experienced it very negatively - it appeared he was on his way to hell. It also changed his life tremendously, he eventually joined the clergy.
I've heard similar stories - not everyone goes through a dark tunnel emerging to sweetness and light. Some describe going to a terrible places. One of the scariest stories I read was from a person who had attempted suicide and failed. They said they found themselves in a place crowded with many other people who were all walking around talking to themselves and banging into each other without paying attention to anyone else. The "nearly deceased" person assumed that because these people were selfish enough to kill themselves - they were also too selfish to acknowledge anyone else that was stuck in this same place.
This person was revived in the emergency room and said the experience completely opened their eyes and changed their life.
Who knows what will happen after death? Many have their own beliefs, but none of us will know for certain until it happens. And I'm in no rush to find out.