It could be a dissociative state - I definitely have that.
Overall, my symptoms get a lot worse when I'm stressed [the literal interpretations of language, not picking up on social cues such as body language (as in, so bad I don't even realize when someone is about to hit me), mind-blindness]. The dissociative states also manifest when under stress.
The inability to speak thing came up again recently so I've been trying to figure out exactly what it is and what to do about it, since it has consequences.