I have Aspergers Syndrome and I have experienced all 3 of those states in varying degrees of severity, but as for the "tonic immobility" you speak of, the only thing I can relate it to is there have been a couple of times where I have gone in to an "atypical or semi catatonic" state where I am able to listen but not respond. In those times, I can sit up and use amenities if need be, but I simply "freeze" in a lying position or sitting position for a few minutes or hours.

I cannot eat or talk and I forget to swallow. It has something to do with sympathetic nervous system shut down in the face of extreme fear or distress. Usually, my fiance will give me pressure hugs in these instances and try and get me to sleep. Sleep usually reboots the nerve response and I come back from it. I cannot remember what happened usually. I can remember the fear, but I cannot remember after it in any clarity.

Hope that helps to some degree.....

Michah