First, don’t tell me that the answer is just to “not bottle things up”, because that’s objectively incorrect too. Society doesn’t want you to have any negative emotions. I need to know how to not express negative emotions at all whatsoever unless I’m alone. I know it can be done because it is done in many other people on the planet.
Edit: Ok so I think one of the things I want to try doing next is ask for a med change from my psych provider.
I’m not sure why you are getting down voted so hard for this. You are describing a very direct awful relationship thats unavoidable. Sort of like an abusive parent.
I would advise you try to find another job, or if you can move laterally in the company that might get you to a different supervisor.
Also, your supervisor can go fuck themselves in their own face.