I had a similar situation as you at work. Ever since I got my first job I was paranoid about getting fired. Then 17 years later my bosses started the process. Though instead of firing me because they were worried about getting sued they bullied and harassed me for 3 years. They withheld raises. But everything they did was my word against theirs. So I started looking for a new job but because I am in a small field it took me 3 years to find a job.

I wish I could have sued them but it was five against one and I had no proof. Now I have ptsd from the experience and it affects my new job. So I recommend documenting everything because it might put them on their heels if they know you are keeping notes. Look for a new job because it could take awhile to find one. Do not let it go on as long as I did. It is not worth it. I would have quit that job long ago if I knew what the aftermath would be. My boss actually said to me “It is unfair to the others that you are still working here”.