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 hate to be that guy, and believe me I was in that boat once. But the solution is to not reach the point where you are exploding from the amount bottled up.
Humans are not meant to be stoic creatures. People have feelings, that’s called being human. You need to find someone you can trust(NOT A COWORKER), and every once and awhile vent to them about things that you aren’t able to resolve with the person that’s causing the frustration. That’s your best solution.
Reading your replies, this seems to be more a super toxic work environment issue which I think if you fix, will resolve most of your issues. Due to this, I recommend ON-TOP of the previous recommendation, also either contacting HR about it, or if you do not feel comfortable with doing that, finding another job. You should not be being bullied by anyone let alone a manager. There are so many work policies in place in most work environments protecting you against this, and not to mention most civilized countries have laws against it.
Being said, if you feel that it is less of a you bottle things up, and more of a you aren’t thick skinned enough to be able to handle the every day work-life without having anger issues and exploding, you may also want to look into some form of Anger management or calming technique. But honestly, it sounds like it’s a combination of the first two issues and less of an anger issue.