Sometimes a nanny is cheaper than two in full time nursery, is that an option? Plus are you claiming all the tax free childcare you're entitled to?
Alternatively the suggestion of flexing hours and/or work days if possible to reduce the amount of childcare you need.
Your DH definitely needs to pull his finger out, both on money and effort. Why is all the cooking and cleaning left to you when you work more hours? What is he doing while you're running yourself ragged?
On the matter of money, you need to start from scratch with budgeting as it sounds like you currently don't know if you have enough income to cover your bills or not, plus what you have left for food, other essentials, DHs debts and any discretionary spending.
On the matter of money and budgeting, moneysaving expert has everything you need to know.
www.moneysavingexpert.com/family/money-help/
Why is DH in debt? Was this due to an 'event' like business failure or is he just a spendthrift?
But you/he are tackling it all the wrong way round. His debts should come after he's made a fair and sufficient contribution to the household pot, not before. If he doesn't have enough left to pay his debts he needs to earn money more or seek debt management advice. Especially if his debts are significant, costing a lot in interest and likely to take time to pay off.
You're currently at the hardest time, with highest childcare costs and this aspect will get better. However your DH really needs to start pulling his weight or else you need to think about separating because it sounds like he could drag you down indefinitely.