I wanted to add that being sued by an attorney because you filed a grievance against him, if the grievance was filed in good faith, would be rare - but when you are dealing with attorneys, you just never know.
The ABA Model Rules for Lawyer Disciplinary Enforcement Rule 12 states: Communications to the board, hearing committees, or disciplinary counsel, relating to lawyer misconduct or disability, and testimony given in the proceedings shall be absolutely privileged, and no lawsuit predicated thereon may be instituted against any complainant or witness.
This, however, is the
model rule, and attorneys have filed suit for defamation over grievances filed which, although their suits may not have had merit, can still be extremely costly for the defendant in such an action. Also, absolute privilege does NOT cover comments you may make to others about this attorney, and upon these comments outside the grievance complaint he can, potentially, build a defamation action.
You have two years in Pennsylvania to file an attorney malpractice suit. Generally a board decision will come before that. A sanction against the attorney can help you with your malpractice suit, so you may want to wait to see what actions, if any, are taken against the attorney. However, consulting with an attorney about a suit now would probably be wise. He can advise you best on the best timing for legal action.
Yes, there are attorneys who will take a case filed against another attorney, especially if the case has merit. And I think you will do best with an attorney handling your action. Pro se's almost always regret being a pro se, as the time and effort that needs to be invested in researching laws and procedures can be extensive, and legal missteps can be costly (missing one deadline can doom your action, for instance). The cost of hiring a professional, although high, is often worth it - and you tend to discover this when you find yourself up against attorneys who know all of the ropes and the rules and the laws.
You can go to the Pennsylvania Bar Association's website for direction on locating an appropriate attorney in your area. And, do be careful what you say to others about this attorney. Stick to only the facts and the truth and you should be okay.
Good luck.