>>17818596 (OP)Death is 0-dimensional. It has no width or height, and you cannot determine how far away from it you are. You're looking down the length of a line, essentially.
As for the not having a conscious experience or fear of not existing, you have to understand where this fear comes from. Get real about what is it that sits at the heart of your life. Get curious as to why it is as such that life content exists the way it does, and that the human body forms an attachment to this experience of life content.
In death, there is no body to support memories, emotion, logic, thinking, etc. there is nothing to "miss" when you are dead, because you need your body to do that. There is nothing to fear either, for the same reason.
The human body loves calories, so much so that it'll sacrifice its integrity to store calories on itself in the form of fat. I think in the same way, the human body loves it's own "life" in the form of instilling fear upon the consideration if death or cease of bodily existence. Even loss of self can facilitate this same fear in people, hence why it can be so hard to change sometimes.
Recognize that this fear is totally normal, and try to read into what your body is telling you through this fear. Do you have an immense gratitude for life? Are you appreciative for someone or something? Sometimes I find expression of the thing that is facilitating the fear can assist in reducing the emotional magnitude of the sensation so it's less dominant in my mind.