God, there are some right bitches on this thread!
Op, I feel for you, you've been given a rough ride on here. You really can't do right as a step parent. It doesn't matter what you do or say, it's never good enough in the eyes of mumsnet.
I had a thread running recently and got hammered by the same people giving you a terrible time. They want the tiny ins and outs of every bit of your life in a bitter attempt to 'catch you out' on something. Instead of offering support or advice you just get a lynch mob.
Some people on here should be ashamed of themselves.
Quite simply if the NRP loses their income (as happened to us) then something has to give. Like you op, we cut back on everything and as I am disabled we had NO income at all and it took six months to sort benefits out. We survived on charity handouts and food banks. Life was horrendous. What didn't help was the unhelpful attitude of the ex who didn't seem to give two fucks that there were two children living in a house with no income, she was only concerned with her DD and how it affected the ex herself.
Personally my ex has stopped paying maintenance again, I have no idea why, he now pays approximately £4 after CMS deductions and I will never rely on any money coming from his direction. What's the point of getting angry over it? He hasn't the money so I don't get it for DD. Simply put, you can't produce something out of nothing. (and my ex is a cockwomble)
So I would really advise you to step away from this thread. Stop worrying about the ex, ignore her messages and take some time to regroup as a little family unit. Talk with your DH about the realities of his job prospects and see if there is another way out of your current situation.
Life can be utterly shit and I really do understand how stressful it is not having enough money to feed the family never mind support another family.