Ive noticed so many people with health anxiety and Im starting to think it is due to the flood of information that has become so available thru the internet, tv programs (im a bit addicted to discovery health channel myself) --all of these stories of people going to bed at night and never waking up or just dropping dead where they stand. You start thinking these things happen all the time, to the majority of the population. Luckily, they dont. The reason you hear about these things is because it makes for good tv, good news, because it is dramatic and interesting.
I guess you can also consider the fact that we are all going to die, and noone has control over this fact. It is a common goal that we will all acheive.

I myself am naturally prone to anxiety. Mine channels into other things--Ive already had a health crisis (or two) so I think that actually helps me not be fearful for my health. After you have had cancer, there isnt much left to worry about! So now Im not really afraid of cancer. I know it can come back, but I also know that I will deal with it if the time comes.
Here is what helps me with the whole idea of death: I could die tomorrow. I could die an hour from now. Id hate to think that I would die knowing I lived in fear--because that is not really LIVING. I want to know that no matter when I go, I didnt waste what precious little time I had on this earth. LIfe is really hard but there is alot to enjoy. we cannot enjoy it when we are busy fearing everything and obsessing over the inevitable.
This is not a lecture. Like I said before, I too am prone to lots of anxiety. Ive spent years being afraid, and being afraid is like putting your life on hold. When you think about it, none of us can really afford to do this--any time we spend in this anxiety induced limbo, is time wasted--there is alot out there to enjoy. Sorry if this doesnt help, Ive really gained a new perspective lately and wanted to share it. I wish you all the best and hope you can find peace and contentment. We all deserve to be happy!