I'm starting to think that maybe I just don't have meltdowns then. Because while what I experience is unusual and out of my control, I can still function relatively normally. There is no fog, no brain shutting off. The only time I got close were the few times when I just passed out from stress.
Meltdowns, though. I don't think I have them. I dissociate a lot though. So that might be part of it. If I feel uncomfortable, nervous, whatever... as long as I am able to go inside my own head for a few minutes, I'm okay.