sue my attorney

You should start by making sure you have all your essential papers in order; (a) marital settlement agreement, if the case was settled; (b) findings of fact, conclusions of law and judgment of divorce (divorce decree) (c) court transcript from your final court hearing (d) your financial disclosure statement (e) your ex spouse's financial disclosure statement (f) any property division spread sheets that were preapred for the divorce by the attorneys (g) any child support or spousal support calculation worksheets prepared by the attorneys. That would be a starting point on what any attorney might need to initially review your file to determine if an error was made and if so, how substantive in nature it may have affected you. If there was any type of a viable case, at some point, the attorney would want to review the entire file from your former lawyer. If you haven't already requested it, you should probably do that as well. I know I have not specifically answered your question. You can look for a malpractice lawyer by finding a lawyer in your area on AVVO, Lawyers.com, Super Lawyers, Best Lawyers in America and any other number of professional listings for lawyers. The statute of limitations for legal malpractice in Wisconsin is generallly 6 years under contract. Faillure to file a lawsuit within 6 years from the date of the  occurrence, will otherwise forever bar your clam.