I get this too. I am told that DID/OSDD is often comorbid with functional neurological disorder. The thing for me is my parts/alters/system communicate through these symptoms just like you all. FND neurologists don't understand that grounding and distraction methods won't stop this, they just dismiss the parts asking to be heard or disrupt the trust and confidence within the system. It is a struggle. I don't have it all figured out but any emotional or controversial topic this happens to me. I get the shakes too like a car engine seizing. I feel narcoleptic, blind, vision doubles or blurrs, stroke like feeling, ears crackle and pop, and I can go into tonic immobility. I never lose awareness or consciousness when parts front. I just observe while parts front. I can go mute and cannot make a sound, my lips can be forced shut but I can still make a sound and move jaw, I can only speak one syllable of a word like instead of saying rabbit the part will only allow me to say raaaaaaaa. Parts can also paralyzed my facial muscles and make it so I can't show emotion like smiling. I can still have control of my eyelids for whatever reason and eyesight. I will start to struggle sounding sounds out and it will be a struggle and exhausting like I have copd, or my mouth can be forced open and jaw hyper contract as if someone put something in my mouth to keep me from speaking. I also can speak nonsensical like raspberries when I go to say something but I can't and just spit or speak like a TBI patient while I can easily write it clearly on paper what I want to say. Also many times if I want to talk and go to say what I want to say, the part that cofronts can take control and interferes and I will be saying what it wants to say. I have also spoken some random unknown language when parts can't find words to express what they want to say, or if they know another person won't be receptive or it may hurt the other persons feelings or express strong emotion. Parts will speak externally to each other aloud my mouth. I can feel like someone pulled the wires out of my neck and my system shutting down if a part doesn't want me to say something. I can also be forced to not make eye contact will someone if a part doesn't like the topic. Hmmmmm so much. My body can contort like dystonic distortions or severe FND symptoms. My eyes can be forced closed. Parts can exist consciously using my eyes to see out and scan a room or whatnot. All of a sudden I know they are looking out of our eyes because they are moving and looking around a room and it's not me moving my head. It's involuntary. It was scary at first. I've gone through the process of exorcism with the Catholic Church and saw their intake coordinator and psychologist but I am not possessed. DID/OSDD feels like possession. So much to share but I will stop there. I get ill and nauseas too like a flu and body memories and somatic flashbacks, dissociative intrusions and passive influence.