It depends on the reason it was released.

You can sue them. You may want to start with an attorney demand letter.

He is not. While it might not be a malpractice case, it may be an ethics violation.

It could be a public disclosure of private acts violation, even if not privileged information.

Look into what small claims court is available to you.

Perhaps the first question is what do you want to DO. Do you want to investigate, litigate, trials, etc. The area of law may be secondary. ...

Yes, you may hire a new attorney. Use the Avvo search tool to find an experienced attorney.

If a demand letter to the attorney receives no response, contact the State Bar.

The attorney must continue to prevent any prejudice until he or she is removed.

It could be malpractice, and would be an ethical violation for which the State Bar can discipline the attorney.