Can I sue my exwife for her forgeing my name on a mortgage note. After the divorce was final.? She was given the house in the divorce and she refied.

She has refinance the house 5 times with my name still on house deed. The banks would not put the house in her name because her credit is bad. She has signed my name to the mortgage papers even though we are divorceed and the court give her the house. Can I sue for damage s because my credit is in bad shape because of this. I want to sue for $ 400 million in my