Unfortunately while you can't be fired simply for having mental illness you can be fired for having symptoms of mental illness that interfere with your work, unless you have written and signed for accommodations that are within ADA boundaries. And I'm pretty sure you can be charged with a crime for pretending to be an attorney and "making threats" (and they would interpret it). So please avoid that urge!

You are in a place though that you need to consider if ethically you need to report what you experienced to the medical licensing board. You would have to do this very carefully so that you wouldn't appear to be seeking revenge. I was in this position a while back and it was really hard. At that time my assistants were documenting things that they were not doing. I was complaining to my supervisor and was being more or less ignored. I was about to start searching for another job and then resign and make the complaint (because all of their lying on records was my legal and ethical responsibility) when I was fired. They wouldn't give me a reason for firing me and didn't even fight worker's comp, but there had been some issues in the past and I accepted those reasons instead of fighting. I later learned that this company had a long history of firing experienced therapists and replacing them with new grads who cost $15/hour less. I just was making a bigger target of myself by insisting my assistants do their jobs. Regardless I should have reported it and was too crushed to do so at the time. A few years later I was working in the same area and had a patient who had been at that nursing home ask me why the assistants (still the same ones) didn't do the things I did BEFORE sending her home to struggle. I really was sorry I didn't speak up then.

It's something you have to choose for yourself. It sounds like there is a lot of medicare fraud along with unethical/illegal behavior there. If you are wanting to report b/c you want revenge that's not a good idea but if you want to report because it seems right then maybe you should consider it.