I'm really sorry to read you are going through this. It triggered some memories for me that I thought I'd share. You're not alone in having this type of experience. I completely relate to your story. In the span of three years, I had two different nurse supervisors, back-to-back, at two different places of employment, in two different states, that could have been the same person. Same age. They looked so much alike they could have been sisters. But the kicker was they both had they same sociopathic personality. I don't use this label lightly. What they both did and said to me, while I was doing the best work possible, with a professional and positive attitude, was horrible. I started to wonder what was wrong with me that I could be so far off track in their eyes. I lost sleep, and a depression set in that I couldn't shake. Nothing brought any happiness to me.
At one of the jobs it started to occur to me early on that the problem wasn't me, it was both of these supervisors.
An example: I was alone in a very small room with my supervisor, and she shut the door to give me my monthly eval. I'll never forget the look in her eyes. The things she said to me were meant to be daggers and were in no way constructive. I remember thinking, I'm dealing with someone who is not right in the head. I wondered if someone had made the same comments to her in the past, and she was just waiting for an opportunity to maliciously use those comments on someone else. I said as little as possible during the eval. She made fun of me and listed what she thought were my character flaws. These flaws were fabrications in her mind. I think she was trying to get me to cry.
After a few months of experiences worse than this, I went to her manager and said, "I can't work with someone I don't respect." I was switched to a different dpmt with a different manager. Talk about a night and day 180 degree difference for the better.
Because of my experiences, I started studying personality types (borderline personalities, narcissistic, and sociopathic personality disorders) and the effects of these disorders in the workplace. It's eye-opening and has given me the tools to deal with people that show signs of these disorders.
I admire that you sought help and wish you all the best. Good things may come from this.