I deal with the same BFS/ALS battle in my mind.
I have little to no weakness, however, my left foot has been twitching daily for about the past two months. I get twitches in other spots, but the left foot is a daily occurrence.
I get nervous when I hear about ALS being very fine twitches that begin in one spot and continue relentlessly until the muscles in that spot are dead. I keep telling myself that I would notice weakness by now, but my mind keeps ALS fresh in my conscious.
Hopefully your fine and get some peace.