wrongful termination in a nursing home - health professional

I am a professional health care provider. I recently informed administration that 'I would not stay at a facility in which the social worker was not apprised of resident abuse/neglect allegations.' Within hours, I was fired and replaced. The write-up did not deal with any of that, but instead consisted of several points which were either not my error -or- were flagrant and slanderous lies. I have proof in documentation pertaining to some of it. I have witnesses who will verify he negatively used my name in discussions with them. He routinely ridiculed me, also witnessed. I was fired in the afternoon, and by next morning they had my 'replacement,' so obviously something planned a while. I need to know what my options are pertaining to wrongful termination and libel.