I noticed a thumping twitching in different areas of my left foot that started about 3 weeks ago. It probably only twitched once every few days, until it was followed by a left calf fasciculation that I couldn't feel but only see. Since then around two weeks past until I noticed a fasciculation that I couldn't feel but only see in my left calf again. Is this frequency typical of initial symptoms of ALS? Could it be anxiety?