Thanks for the reply. Though I have trouble with understanding your point. I consider consciousness limited to the dictionary definition: being aware of itself and its surroundings; a state of being conscious. You lose conscious when you faint and regain conscious when you awake. As such, you lose conscious when you die, becoming unconsciousness. But if you're talking about a higher consciousness then do you mean something immutable such as a soul, or spiritual energy?
I'm not sure how this ties into "death is not the end" without using theological arguments: the existence of a higher being that transcends the universe (physics/biology). I don't subscribe to these believes. I don't think you need consciousness itself (a higher consciousness?) to observe your surroundings or the universe. That would require me to ignore the laws of nature in favor of mysticism. I consider the brain capable of generating audiovisuals (dreams) without the need for something more such as a (higher) consciousness.
To clarify, would you mind pinpointing exactly the thing you believe exists? I understand the concept souls and spiritual energy, but don't understand what you mean by "it's the only thing that stays still while everything else is constantly changing." Does that mean this thing can become part of something new, such as in your example, "coming back again as something else in a million years?" I have trouble wrapping my mind around how such a thing would work.
Edit
I now read your last past: you're not talking about about souls or supernatural things. But I hope my other questions still stand.
What I meant by that is while your thoughts, emotions, body and identity etc is constantly changing there is something within you that observes this effect which is always still and that suggests that it's the most real and reliable thing you have. I think it's necessary to have this because to be able to differentiate you need something even or flat to begin with.
I believe in science, but science is used to measure and explain how the world works. They tell you what the stuff is and what it does, but what is it MADE of? Then you find nothing. Nothingness. It's like empty space holding everything together like a god. Nothingness is stillness, and we can't truly picture it in our minds because it is formless just like what we call consciousness. I am less negative about this now, because I think it's the same stillness, nothingness and peace you get if you were to burn all your thoughts, identifications and attachments so you were just conscious and nothing else. While you can't literally do that, I think you understand what I mean. This is why I believe that I am truly formless, and my body and brain are my tools and suit which we call a person, which is kind of like a mask. What is formless cannot die. Therefore I think I will go on after my brain and body dies, and I will experience the universe from a different point of view.
No one knows for certain though. I hope I clarified my beliefs well :)