Hi lowprofiler, thanks for your reply.
Believe it or not this is the second time I have faced divorce
I really know how to pick them don't I?
Last time it was so much more clear cut, he was a grade 10 arse
and there was no question of what I should do.
This time though I really loved dh (I don't know how I feel anymore, he has bled me dry of feelings), and I thought we would be together for the rest of our lives and I could make him happy (yes, I know...) but nothing ever makes him happy, he is the most negative person I have ever met, and to top it off he has a huge chip on his shoulder, which is obvious to everyone except him 
As far as I can tell, as I am never sure if he has ever been honest with himself let alone me, he trusts no-one, nothing is ever his fault, he expects everyone to 'do him wrong' and is extremely self-centred, even when it comes to the kids 
I have made him sound terrible, he does have a helpful, caring side but I see that less and less as time goes by. He would also say it was me with the problem, he told me at the weekend that 'I am a control freak, who is always having a go at him, is never happy with what he does and he hates being married' 

I think I am going to explore all my options and then decide what I want to do. I have found a couple of useful sites CAB and MoneyExpert I think it was called today and had a read, and have checked my benefit entitlement on Entitledto, but am just so so sad that I am going to have to tell the kids if we split up, whatever will my 11 year old dd think of men after going through this before with her dad and now facing it again? 
I have heard that it is a bad idea to go to couples counselling with an abusive partner so not sure if that would be an option, even if I were able to persuade him (he 'doesn't do' talking to strangers apparently
).
I hope it's all going as smoothly as possible for you, and that you do have someone in RL to talk to.