Defamation of character, vexatious, harment at work

I suggest that you consult an attorney. It does not seem as if your supervisor is behind you. You may need to quit you job.. My son had a similar problem about a year ago. He decided that he would do something else, it wasn't worth the pain. He quit his job. They kept asking him to to back. He said he would come back when the person was fired. It happened.