I hate to be blunt, but no, you never stop thinking about it. The only thing that improves is the NUMBER of times you think about it as you get farther from diagnosis. Yes, it subsides, but is always in the back of your mind lurking.
On day one of my diagnosis, my doctor told my wife while i was still coming out of sedation from the colonoscopy that "your husband has advanced cancer, and your life will never be the same as you knew it from this day on." He went on to tell her that he was, in fact, a colorectal cancer survivor and that I could be as well....butt, it doesn't alter the fact that life will never be the same.
By the way, my life is GREAT! My new life, I should say. New outlook, new expectations, new friends, old friends who are closer. Terrific wife and kids.
....and butt burn everday of my life
BUTT, I'll take it over the alternative.
Best to you,