Smells, I needed that quote today. I had a shitty day, my son had 3 meltdowns (autistic-style screaming fits, complete with head-banging, kicking, scratching, hitting, and self-injury) and I have no idea what triggered any of them. During the last one, he was completely unable to speak except to scream, "Go away, mama! Go away!" All I could do was put him in his bed, where he's least likely to hurt himself, and pray that he'd calm down on his own.
He did, eventually, and fell asleep at 7:30. But I listened, helpless, at his door while he cried for almost 45 minutes straight, knowing that if I went in to check on him, it would only increase the odds that he'd resume the self-injury.
He doesn't do this very often any more, thank goodness. But he's big and strong enough now that when he does, I can't physically contain him enough to ensure his safety. Last time he melted down like this, he put a hole in the wall of my in-laws' beach condo with his head.