It may be possible to have the Separation Agreement nullified under the circumstances you describe,
especially if you were under duress by your spouse or his attorney. I would have to review the Separation Agreement to see what exactly you agreed to and how one-sided the Agrement is.
If you are living in the NYC metro area, please call me at 212-370-1660 to arrange for a a meeting to review the Agreement.
Leonard M. Weiner, Esq./Divorce Solutions