Hi, sorry to hear you suffer from this symptom.
I went throu a very bad period at one point (not bad for me ME/CFS wise as I wasnt bedbound like I'd been in the past with this illness but bad period as my symptoms switched and went very neurological. Ive gone throu several different symptom complexes with this illness).
I had fasculations happening, spasming (sometimes who body, I once got thrown on the floor on my face cause I had a huge body spasm) and tremoring ..sometimes together, sometimes separately, they were just all different symptoms I had when I go into a bout of neuro symptoms. My tremors were on and off things but for one period I had them for 3 weeks constantly. A doctor saw me during this time and freaked out at all my neuro symptoms even thou I told him they were normal symptoms for me (I also had hyperreflexia with my reflexes, dr nearly got kicked in the face when he tested my knee reflexes) and rang an ambulance. He also had seen me fall into a wall when I'd tried to turn the corner to his office.. my balance was so bad.
On the way to hospital in the ambulance, the ambulance officers noted that my eye pupils also were responding quite differently. (the dr cause he wasnt aware that CFS can cause severe symptoms, he thought I'd taken a drug overdose or that I had serotonin syndrome thou i wasnt even on any serotonin raising drugs at all but I assume cause I had CFS he must of thought I was on these). I was also very sensitive to light (it sent me into shaking and hurt my eyes).
At the hospital, a matron mistook me on seeing me as someone who had parkinsons disease. Two neurologists came and saw me and I hit the floor instantly when they had me do a Romberg's test (I went down so fast that they both missed catching me). Crazyily, they kicked me out of hospital the next day, not knowing what to do with a ME/CFS patient so I never was put onto meds when I had those severe symptoms.
And to top off being kicked out of the hospital the next day.. the dr I saw who had called the ambulance, refused to see me again due to this all being CFS caused (so many drs have refused to deal with my "CFS" or rather ME as I know it to be. "CFS" people arent meant to get symptoms like this, I even had a "CFS" specialist I see who believes that ME and CFS are the same thing, tell me due to my neuro symptoms that those couldnt have been CFS, yet he refuses to believe that ME is different).
Currently Im not into my neuro complex ME stuff pattern (I still cant walk a line like police make people do to test for drunkeness) but rather are now having things such as what appears to me to be maybe Narcolespy (I can suddenly fall asleep) and back to my old virally symptoms eg night fevers when I do too much, sore throat and some kind of viral outbreak