Oh yes, I agree with that! If your neck is out of whack it will cause all the feelings Serenade listed, and dont forget tingling in the fingers as well, and extreme weakness in one arm. I dont have ALS but I do have a mess of a neck. Chiropractors help, and even getting a steroid injection into the c-spine can help. I went to have an EMG done once time and he had me put my arms out straight, palms facing in and then he told me to push outward against his hands. It was the weirdest thing, every single time my right arm would just flop right over. No control at all! That time the shot did the trick. Also, about the neck brace. From my personal experience, and my dads, those look really comfortable like your neck would get a rest or something, but they really arent that comfortable. Mine actually makes my neck ache something terrible. If the neck brace you get doesnt help there is a thread on here on how to do a homemade neck brace that is more comfy for PALS. Just look under the search button at the top.
Best of luck,
Kari