You should immediately file for unemployment benefits. Filing a wrongful termination lawsuit is more complicated matter. As a general rule, Ohio is an "at will" employment law state; however, if you were terminated for attempting to prevent an act of violence or complaining about a violation of law/regulation, it might be possible to file a wrongful termination lawsuit. These type of cases can be lengthy and many of them fail.
File for unemployment benefits immediately, start looking for a new job, and if you still want to consider a lawsuit, contact local attorneys for a consultation.