is my idea of the afterlife possible at all

[Ace Otana]

if this is not possible AT ALL please explain why

Well we must stick to what we know at this point in time. We can assume anything. From the simple to the complex. So to remain with reason we stick to what we know, not what we can imagine. I don't think it's possible to continue existing (mentally) when our body and mind shuts down.

Death is the end of biological function. The brain is us. We are the brain and it really is nothing more than a lump of pink bio glob that functions with oxygen and many chemicals. When the brain shuts down, so do we. Mentally, we cease to exist. The data stored in the brain which makes up our personality, our memory and the ability to use senses in our body shut down and degrade. We won't even be aware that we're dead or have ever lived. The data required for conciousness, awareness and memory is gone. Try to think back before you were born, that's what being dead is like. It's hard to imagine being in such a state. Sleeping is a good way to comprehend it. Just without dreaming or waking up. Hours pass and you're completely unaware. Time and space no longer has any meaning to you. You'll be beyond such things.

I am confident that you do cease to exist. People who've suffered from a lack of oxygen have lost their memory, the ability to understand and talk, because parts of the brain were shutting down. The data was being destroyed.