LOL, Justascarf!!
Well, a lot of these things can scare me as well - especially since I have had these diseases for most of my life. I also have such a high risk of having cancer - several types run in both sides of my family - and I've learned to live with that without panicking somehow!!
One thing I realize - there is risk in life. I could be in a very bad auto accident any time I go somewhere, or any number of other things that are "risky" in life. Sometimes I even have to talk myself down, as my anxiety will kick in - but mostly I refuse to allow myself to dwell on it.
Knowledge
is power, and by knowing what
could happen doesn't mean I have any more of a chance of it happening, but it does mean that I may be a bit more prepared for it
if it does happen!