I have the same thing, I went on
zoloft,
and was prescribed the wrong dose. I had a distomic tremour,
and every time, no matter whether I am cold, wether I am to happy, ect, my right arm twitches, my neck and shoulder twitch, and my head goes, I have even had attacks that have absorbed my whole body, and gone to hospital recieving cogenten ( spelling) to calm me down.