Would it help to make an extensive list of:
- the things you need to achieve every day/ week
- the reasons you think you're not achieving them
- the things you're pleased about to do with handling your life
- the pluses and minuses of your relationship
Once you have this on paper it's much easier to take a proper look at your life and find a way through it.
Going on strike will provide very short-term gain but add more stress in both the short and the long-term. You say you think it's immature but you're doing it anyway; your DH will almost definitely see it as immature, unsupportive and mean. It seems to me that neither of you understands each other's perspective and until you can do that you can't move on.
I once heard a marriage counsellor (with 20+ years of experience) say that he's never encountered a marriage that couldn't be fixed. With that in mind, believe that there IS a way through this which will result in a stronger, fun and more supportive relationship.
You and your husband firstly need to get to know each other again - organise a 'date' - even something as simple as an afternoon on your own in the park while his parents look after the kids. During this time you must ban all talk of your home lives. The point here is not to sort out your problems, but to connect.
If you think you'll struggle for something to talk about, why not both watch a TV programme or listen to a radio programme, and then use that as a starting point for discussion.
I suggest that you find a marriage course or see a marriage counsellor, though often men are reluctant to do this. It is basically a way of investing in your marriage in the way that you might invest in your career - ultimately I'm sure your marriage and family lives come first for both of you, regardless of how chaotic things are at the moment.
I suspect that your money troubles are adding to your husband's temper - he may even feel humiliated/ emasculated by the CCJ issue. This is not an excuse for the way he's been treating you, but it might help to explain some of his behaviour. Also four children in 5 years of marriage is a HUGE deal and will have tranformed your relationship dramatically.
I have to dash, but I hope these thoughts are of some use.