Not sure what you mean here...is your ex-boss giving bad recommendations so you're not getting a new job?
If so, in most states, this is a liability (which is why most employers just confirm job title/dates of employment). An option is to have a friend call the old boss, pretending to be a new employer, and document the ex-boss' comments (or better yet, record the call - you wouldn't be able to use the recording in court, but you'd have something to replay to an attorney). You can then have an attorney write/call telling the ex-boss to cease and desist. Try to see a labor attorney, if you can.
If I understand what you're saying is happening, there are definitely ways to make him/her stop.
GOD BLESS and PROTECT YOU.