Ella, I first realized something was wrong when my left arm started twitching and having Charlie horses. I thought it was part of my fibromyalgia so I ignored the symtoms until I lost my muscles in said arm. While waiting for my scheduled M.D. appointment I, like you, went online to research...
You should have your potasium checked as well. If you're low you will experience twitching and cramping as well. The more you are stressed the worse it becomes. Good luck to you.