Hi,
I'm sure the others will be along soon with some ideas for you.

I know a few have had locking up or dystonia type problems of hand, arms or legs.

splinting has been mentioned, muscle relaxers or injections too I think.. that's just what i recall reading.

I wonder if Low Level Laser or Ultrasound treatments would help?
I don't recall seeing anyone mention those...
I suppose if it is a muscle based cause those might work , but if it is nerve based they most likely would not.