Is there a way to vacate a civil judgment in Tennessee?

My lawyer went to a court hearing that was scheduled without him telling me. He then took it on himself to work out an "Agreed Order" without my knowledge or permission. He never told me what he did. I received a letter from an attorney on the other side about 6 months later that mentioned the judgment. I called my lawyer and he denied it, and kept on denying what he did until I went to the clerk's office and got a copy of the judgment. I have filed a complaint against him, but can I get this judgment set aside. It's over $100,000.00. If someone told me this could happen, I wouldn't believe it.