I went through a similar situation after my divorce where my ex-husband was supposed to pay child support but consistently failed/delayed payments for years. It caused me significant financial stress as I was struggling to provide for our child.
What really helped was that I sought out help from a lawyer who specialized in family law. He advised me to apply for and receive permission to take deductions from my ex-husband's pension directly into an account that was specifically set up for the child's care. This ensured the payments would reach us regularly, if they ever stopped coming.
Another tip I'd suggest is that instead of handling it all by yourself, don't hesitate to approach friends or family members who might be able and willing to lend a helping hand. We sometimes find it difficult to ask for help, but it can make things easier in emergency situations like unpaid bills/maintenance.
Also consider finding programs such as government assistance, if qualified . These could offer temporary relief from your financial struggles.