Please read this!
It is quite usual for husbands to behave in a slightly less mature way than the baby. I don't know why, but there it is. I know from personal experience it can make you feel terrible, but I found it helps to know that it is normal and not your fault.
If he won't help, I have to disagree with other posters and say there is no point in trying to force it. It doesn't work. You have to think about ways to get round it yourself.
I agree that it isn't BF which is exhausting you, but getting no sleep and feeling totally unsupported. BF is also so comforting for your ds, who is having a pretty bad time too.
If your dh can't or won't support you, have you got friends or family who could help? Even if they just come over for an hour while dh is at work so that you can sleep, or help with the hoovering/make supper with you. People love to help and love to be asked - you are not imposing; you are allowing them to feel really good about themselves.
If not, I think HV will have to be the last resort. From my experience and what I have heard, they are very keen on independant sleeping and will be keen to advise on CIO (although I think that might be the hardest thing for you and ds).
Our hospital has a breast feeding consultant who was very supportive. If you put the problem to them as a 'Am I doing OK at breast feeding?' rather than a sleeping problem, they might be able to help. I think you need someone.
Have you thought of taking him downstairs for the night? That is what worked for me when things were at their worst. We slept on the settee (and in a cot next to the settee) in front of the fire and woke and watched bits of all night TV (not all awful!) and slept a bit more and got by like that.