Are you on friendly terms with the ex? I ask because my brother and his ex worked things out without the courts. There was a period of time that my brother paid little to nothing--but then when his son needed braces and later a car, he bought both of those things completely. Maybe you could work something out in terms of specific items that you can provide at this point in your life.
Things stayed "nice" between them until he remarried (which was after she remarried, btw) and then she got nasty and started getting lawyered up for money.
I also don't know what your schedule looks like or who has the kids when, or their ages, for that matter. But I know that we pay almost $1000 a month for child care for our kids (one all day, the other in an afterschool program) and that would be greatly reduced if one of us stayed at home (like I used to do).
You mentioned payments for other things--can you reduce any of those before the child care? Maybe look into that--again, don't know much about your situation.
The final thought is this: you shouldn't have to pay for the ex's debt--that sound unreasonable, again, depending on the situation. I would try to get rid of that before the child care reduction. How would the kids be doing without that income?
Just throwing out some thoughts.