Look, I get it. My fear is bulbar onset, so I am a compulsive tongue/swallow/speech checker. (That's not to say I don't worry about that twitch in my left thumb or the size of my thenar muscles etc etc ).
It's a terrible, terrible state to be in. But I try to remind myself that even if ALS does start out with subtle sighs, it doesn't stay that way for long. It announces itself. There's no need for us to hunt it down. You've probably read enough posts on the DIHALS board to be able to tell the HA sufferers from those who turn out to have early ALS. And interestingly, the latter are usually the calmest.
Hang in there, time is our friend.