Hi mdh157,
You are taken by fear right now, it sounds like. Try to observe that fear, feel it (as in contact it as something specific and distinct in your body awareness, not a global engulfment), and dismiss it like an obvious TMS symptom you all ready know about and can dismiss. Do you have that mastery yet, with other symptoms? Maybe not mastery, but a good practice with them? If so, apply that to the fear. Feel it, name it, see it as TMS, dismiss it.
Remember fear is the biggest distraction, greater than physical symptoms. Gently inquire into what it is you don't want to feel in this moment.
Also, try to apply this witnessing to the twitching. So what, the hands are twitching. Are you safe in a place of protection? Is your life threatened? Probably not, but survival stuff is getting activated maybe. Be present and brave with it, as best you can.
You are in fear. Simple. Nothing more. Hard to bear, perhaps, but observable, witness-able. Same with the twitching. "If we can see it, we are larger than it" Dr. Richard Moss.
Hope this helps a little and hang in there. This acute feeling right now is probably a great training ground for the rest of your life!!
Andy B.