That's what usually happens, some can't handle this and live their lives missing those who they lost as if they have lost a part of their own being and some just move on. It's interesting that from the many NDEs I read, many find themselves into this Darkness or Abyss, I think this happens because in that very "moment", you lose everything, even the idea of who you used to be so you are projecting nothingness into your own awarenes and then you move forward. I had such experiences and they are very scary, it feels like fading out of existence, the irony is that you are actually "returning" to your true Self, for this little self it feels like that. At least this is what my research and my experiences made me to understand.