Hi, I read your post about arm fatigue. I am glad you don't have ALS. I am writing because I also have arm fatigue, but it started a few days ago with lots of pain in my shoulder/neck area and lots of pain down my arm. The soreness has let up a bit, but the fatigue and twitching hasn't. I was wondering of you had pain or if you asked the doctor about that too? I have widespread twitching (BFS diagnosis), but it's more consistent lately in my left arm/shoulder. Thanks!