Twiglett, I'm so sorry, only just seen this. You poor thing, and poor dh. It might be worth him asking about infliximab if he hasn't tried it; it's a drug that can work wonders for some people but which is not readily prescribed because it's so expensive. I'm been on at my mum to ask about it but she never wants "to cause trouble"
Hugs, and if it's any small comfort I've just sent a nice big package off to you.