I use to get muscle twitching all the time when I was younger. At the time, I was a major hypochondriac, and I literally thought that I had some sort of disease, because my mind was wandering so far down the path of "what-ifs." I actually went to the doctor, and he told me that he couldn't find anything wrong with me other than slightly elevated blood pressure. Of course, I realize now that it was all related to a high amount of stress and anxiety, but a hypchondriac cannot shift their focus away from the idea that they may have any and every type of ailment known to man, and that every small thing is a symptom of that. Back then, the more I freaked out about it, and scared myself to death with what-ifs, the more torment in caused me, because insane amounts of fear causes psycho-somatic illnesses. Fear only creates and compunds every negative thought in the mind. Fortunately, I have matured in many ways and now understand that focus and strength of mind begin by will power.