Fear of Non-Existence

    Sometimes I wonder what happens when we die? Do we face rebirth or do we just fade into oblivion? What if we've been reborn again and again and finally some upper forces say we're done rebirthing, then what happens? Do we float in space - a nameless, faceless entity or do we join the Upper Forces in what others call Heaven?
     I imagine our lives like reels of film - once one is completed, we have to replace the reel for the next movie. So let's say now we're in the 21st century and our movie ends then we'll be in the next 'movie' say in the 22nd century and so on and so forth. But what happens when the Earth no longer has centuries? What if the Earth is destroyed  some billion years later when we're in the midst of changing our reel? Do we reborn in space, floating our existence away? Where do we go from there?
     All I know about life is learning and growing up, finding your dreams and success, but does it all matter when we're a floating speck of dust in space? Is there a dream or goal to achieve when you're not in your human form? What are we we're not alive?
      What is the fear of non-existence known as because I think I may be having it? Sometimes at night when I go to sleep, just before fading into slumberland, I think about non-existence and I have to control my heartbeat which starts to race in fear. I have to think of other things just to get the thought of non-existence out of my mind. Does anyone else feel the same as me?
     I don't know the significance of the things I am doing in life when I think about my non-existence. Will it matter whether I have money or food or clothes when I do not exist? What am I if I don't exist?
     The good thing is that when I wake up, I forget all about the fear of non-existence and go on with my usual routine, which is significant in the daylight than when I think about it at night.
    Am I a freak?