I've been thinking bout your post all day. I've been getting into the anger with my T and I feel like a loose cannon. I find myself infuriated by very minor annoyances. In my case, feeling anger terrifies me so I have a fear reaction, but I still find myself being way more grouchy than I am comfortable with at work and with family. Long term, I am working on pressing anger and learning to modulate it with T (literally, every session is me blowing up on him and us working through it. It is slowly helping, so have faith about your new T!)

Short term, what helps me is trying to narrate what's going on to myself--I will mentally say, "Ugh, I am so annoyed that he did X! I feel like he didn't listen or care at all. I'm getting all tight in my muscles. And I'm clenching my teeth. I'm so freaking mad!" For me narrating it gives me an extra second to catch myself before I feel like I've lost control. If I can get out of the situation, I sneak into the bathroom and doing something to engage all my muscles--like a full-body squeeze & release of all my muscles, or some squats, etc. that helps me feel more present too.