The feeling that Krex described, the feeling that you want to cut yourself, because when you meltdown you feel too much 'in your head' and you want to connect again with your body. Yes, I can understand that. I feel it like the head has severed connections with the body.
I don't feel any emotions with meltdown, it's just like a computer crash, I can't take in any more information and I can't understand what someone is saying to me. I feel like my head is completely stuffed full and refusing to take in any new stuff. The next day I usually feel 'raw' like I've been skinned, very sensitive to everything, noise especially. It takes me a few days to 'grow my skin back' if you know what I mean. To feel strong enough to function poperly. System overload I'd call it.