Hello.  I am so sorry that you are going through this.  It sounds exhausting.

I do not believe that you are the problem, but I do believe that everyone wants you to think that.  You ARE being gaslit.  I actually thought that before you suggested it.

The higher ups don’t feel comfortable with confrontation and he is harder to confront than you are.  They are not correct in this situation.

Listen to your “gut”.  Do what you need to do to take care of yourself.  Consider if this “career” is really for you if it makes you so upset.  It’s ok to change lanes along the way.

I wish you well.