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I am sorry to hear of this difficult situation.
When the agreement was filed was it not filed in the same court file that had the ongoing matters?And did that agreement cover all the ongoing issues and settle them?
What level of court is this?
The agreement cannot be nullified. Rather, you are seeking to vary the agreement based on a material change of circumstance.
You would prepare the documents and then when you file then with the court be sure the clerk knows that there are two court files, which is unusual.
The forms are found here:
What more information would you like?