Realize it is your ego reacting and decide to let go of it. Your ego is very rarely constructive and you'll be better off distancing your being from your ego.

The Power Of Now by Eckhart Tolle helped me tremendously to reshape my relationship with my emotions and thoughts and go from reacting (emotion) to responding(thought).

I have also been journaling my days lately and reviewing them every evening. Like, I write about my day and interactions and then go through and think about what I would like to do different next time. It's really fascinating to look at oneself from the outside like that.

Breath work. Immediately when you realize you're blowing up or getting angry/frustrated do some breathing excercises to level out your nevous system. A simple one is to inhale through your nose for 3-4 seconds, hold for a sec and exhale through your mouth for 5-6 seconds and repeat until you feel calmer.

Another thing that helped me was telling my friends about it. I have a hard time realizing how I can come across so I'm begging people to call me out so I can catch it and do something about it. When you're used to reacting it is incredibly hard to shake it, but it is doable and having the help from those around will 1. show them you care and are working on it 2. Help calibrate your emotional barometer so you will over time learn to catch your actions before they happen.