honey our advice is go and start living NOW
No one knows how long they have on this earth.
You have no symptoms of ALS, so start living. There is not treatment for this disease, so it doesn't even matter if they missed it (which they didn't).
This should be auto - applied to far to many of the posts seen in the DIHALS section. What a waste of your life! Please stop this madness now. Having dealt with some health anxiety myself, I know how real the fear is now but please don't do this to yourself. Get out there and live! Life is a terminal condition, and no one has time for needless worry.