I have that. Sometimes my body feels like it shuts down and i can't move. I've never had a therapist tell me i have it, but reading about what it is it's exactly what i experience. Smetimes its the whole body. Other times its my legs only or arms or 1 arm and both legs or something weird like that. My last therapist said i was making it up, but i know im not. My boyfriend believes me because he has witnessed me have this kind of episode many times. No one would believe me but him.