It's unremittingly miserable when you are eaten up with anxiety from having to watch your child torturing themselves. The worry is just crushing. You so want to be able to make it better for them, and you can't. And you still have to somehow soak up their rage and distress about it all, while also tending to your own needs. And sometimes their needs conflict with yours - and what do you do then? You know you have my sympathy, BTM. 
How are things with your ds, Beachy?
Yes, addle, 'twas indeed my ds who managed to break his arm when I was out with the crepeys. I'm very glad to hear your dh's attitude has mellowed a bit and he is more amenable to getting help. In my (sadly extensive) experience, the blame game, denial, and lack of insight are all part of the illness. Dd has times of clarity now, which highlight just how unwell she was before. (and may still be again - the whole business is nothing if not unpredictable, particularly now she is off the meds, and has extremely free-ranging moods). I could also relate a bunch of stories about my ex and indeed my own MH issues, but that would probably not be hugely cheering.
Waf, hope your dh is not too poleaxed after his first therapy session.
Thanks all, for the lovely comments about our Fb photo. It was indeed a nice moment in a year when there have been many not-nice moments, so I am keeping it to refer back to when it all goes horribly wrong again.