Contact your state bar association and file a complaint if you feel he/she acted unethically. Then contact an attorney and discuss the possibility of a claim for damages.
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Speak to a local atty asap. I dont know mal pros law in your state. Generally, it requires that you prevailed on the merits. Also, it may require that you prove that no reasoanble atty would have taken the action the atty took in the case, based upon the law in existence, and it wasnt reasonable to argue for an extension of the law in the case. Or, if you can show the action was taken for improper motive. Not an easy standard.