Since the question has been asked, I would like to share some of my thoughts on the subject.
We are "all in the same boat" here as they say, so we can speak from our own experience. I'm a newbie in all this is so I only have a small amount of experience. But I'll share what I've experienced and what I am learning so far. Thoughts about "dying" are new for me too so I've been thinking about this a lot myself. Still not sure why this is idea of dying is new. Last year, I most certainly had prostate cancer and was well on my way death, but was totally oblivious to the reality. I tried to live my life then as fully as I could, something that I have been working on for quite some time. But why did I suddenly feel like I was dying? Who told me I was dying? What is really different now?
What's different than last year for me is that I'm actually healthier and feel better now that I'm under treatment. I was more dying then than I am dying now. So how is that in my mind sometimes, I am now dying? The truth is that we are not dying, we are either fully alive or fully dead. Today I am fully alive, and more fully alive than I have ever been in fact, because only now have I really accepted the truth about life. Only now do I understand what it means to be fully alive. Only now can I fully live. I have been given a gift that many others may never receive. This may be the final lesson of my life, but it is one I intend on learning as completely as I can.