I'm really sorry you're going through this with your job.
Stay in contact with HR and maybe they will be able to do something. Could you write out a log of specific incidents that have happened? I know it's after the fact, but it might help to have something written to pass on to HR. Is there anyone who has witnessed the abuse you've endured who could speak up for you?
I hope that, one way or another you will some peace with your job.