I have sued a psychiatrist but I'm not a professional of any kind.

I just want to add to what others have said- a psychiatrist can be disciplined criminally, civilly, and through their medical licensing board.

In my case I also reported him to my insurance companies, Medicare and Medi-cal. They revoked his ability to accept Medicare and Medi-cal patients.

Once the medical licensing board revoked his license I reported him to the other states where he held a license and they revoked his medical license, as well.
My understanding is that state medical licensing boards do not/did not share disciplinary issues with other states- so it was necessary for me to inform the other state medical boards myself. You may or may not want to pursue this if the psychiatrist/M.D. in your case has his license revoked in your state.

It was a very unpleasant experience. The medical licensing board case resolved first within a year or two. The civil case lasted two or three years. The criminal system refused to indict him in my case even though he had been arrested for a similar crime with another patient. I was told I did not have sufficient evidence.

What I learned: success does not depend on whether you are in the right and he is in the wrong. Success depends on what you can prove.