This is a very difficult question. To know what after we die is. You first have to know what live is and what we understand when we speak about our consciousnes.
We have all this image in our brain how the outside world, the reallity. We think there are living things and death things. Someone thinks after death there is a soul and you are happy forever someone thinks you are reborned and other think there is foreever nothing. Then there is the image about yourself, our personality, our memories, our thinking and ...
When you oberserve yourself your thought, emotions, your body then you will sooner our later reallize that everything of you is automatic. Your thoughts come automatic, when you want to take a glass of water your not thinking how to control your hand, which muscles you need to control your hand goes like magic from alone, you recognice that you are nothing other than a bunch of thousand of thousand programms. You personality how you react with others that are automatic programs. In simple words you don't exists, you are the result of million neurons, programms.
Then there is this question why are you borned in your body not in someone else? What happened when a part of your brain get destroyed or changed? When your brain is simulated in a powerful computer?
I have thought long about this and my short answer is nothing will happen then. I think that we are information that everything in the universe, everybody is united, part of a big network, our image about ourselfes is an illusion.
I think the trust is between this two sides. There is no heaven, hell, our soul (I explained this bullshit with good arguments in the other afterlife thread, everybody who belives in such think must be totally stupid) and nothingnes. Your live goes forever away because your memories die with your brain and will never get reloaded, but live goes at the same time because other people, animals will still live for eternity. We always think about entire nothingnes because we see the world just through our eyes, but fact is live will still exists in other, just we die.