Personally i think the fear never goes away, we all just kinda learn to put it to the back of our minds.
I've found the longer it goes on, the bigger the gaps get between times when i think its gonna reappear.
Have you thought about some counselling maybe?
We all cope in different way, some can handle the fear better than others, this doesnt mean you're weak in any way ok!!!!!
As for your life changing....i can totally relate to that, cancer has made me a much better person, more considerate etc.
Good luck, 10 years eh? gotta be something right there then!!