From my experience anger just doesn't "go away". We always have the potential to be angry - about anything - on TRT or not on TRT.
I learned that there are two kinds of anger; a good anger that makes us feel proud and a small, petty anger that always makes us feel ashamed. Example: I'm angry that in this country our economy favors the wealthy few at the expense of the many and so many people suffer as a result. I'm angry that the big banks blew up our economy and the middle class was left holding the bag to bail them out. A small, petty anger: Getting totally enraged when someone cuts us off while driving, or seething when someone doesn't recognize our accomplishment and gives us the praise we felt we deserved. Or getting angry that someone didn't speak to you in the right "tone". There's a big difference between these.
My advice: Don't be easy on yourself and give yourself any excuses - TRT or not.