Yeah it's damn hard alright.
How old are you? It's not likely to, the majority of people are still in good health (well, within our society anyway). Think positive.
That's what I try to do anyway, as long as I'm active I'm okay. It's when I've got nothing to do I muse over it and then it gets bad.
The same could be said for not getting your hopes up though but who knows? You have to have pretty bad luck to get what I have, I'm sure you'll be just fine.