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What you can do is bring an application to the Court to vary the support order, based on a material change of circumstances. You can also ask for an order rescinding the arrears owing since you lost your job.
You will have to provide the last three years tax returns as well as proof about this year's income.
You can self-represent.
When you get the new order you would then register it with Maintenance Enforcement.
You can get some help for free here:
Let me know if you need any further clarification.