I'm Doug, and I'm very sorry to hear of your situation. My goal is to provide you with excellent service today.
If, and this is a difficult hurdle to get over, but if you can prove Fraud in the Inducement---showing that she defrauded you into agreeing to the Maintenance Agreement and that absent her fraud you never would have done so, then you have the grounds to file a Motion to set aside the judgment based on fraud. This is not an easy thing to prove and a local family law
attorney with a full and complete understanding of the facts and potential evidence in this matter is almost a must if you are to have a chance at succeeding at this attack on the otherwise rock solid contractual agreements.
Unfortunately, emotional stress/duress is not relevant as a basis by which to have a contract set aside. Duress sufficient to set aside a marital contract of this sort would have to entail threats of physical harm to you or a loved one if you would not agree to sign the agreement. So, based on the facts that you have set out, you would have to attack the judgment based on the issue of Fraud.
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I wish you and yours the best in 2015,