You may be able to sue under a Pennsylvania statute that governs the filing of frivolous pleadings, even if in federal court, though I do not know if Pennsylvania has such a statute as New Jersey does (I am admitted in New Jersey and New York but not in Pennsylvania). You may also, without filing a new action, make a motion for sanctions from the E.D. Pa. court. It is likely that you may have missed your best opportunity to do this under the provisions of Federal Rules of Procedure 11, but as a pro se party the court may have find a way to order that you be made whole in some form -- it has broad discretion to do so. You should also file a complaint with the ethical authorities in Pennsylvania.