yes other people have posted AND I told you it has happened to me.
How can you be sure????? How can you be sure you don't have a hidden heart problem right now? How can you be sure you won't get in a car accident tomorrow or struck by lightening??? You can't be sure.
Bottom line: Joyce you will never be sure no matter what you are told. this surety just doesn't exist--at least for a HA person.
so you have a choice to make, continue to monitor/google/self check and live in fear of a disease you don't have OR take a leap of faith and realize the farfetchedness of you having ALS and start working on your thinking disorder. How much of your life are willing to give away to anxiety?