One of the hallmarks of recovery is when you can stop and think things through before reacting. Sometimes you can write a letter to the person who has made you angry, but not send it. Reacting with anger rarely helps make things better. If you start writing your thoughts and feelings in a journal, you will know yourself better to manage relationships. One form of self-care in the communication department is the bullet journal.
Another way is getting honest with yourself. A good resource for learning to manage yourself can be workbooks and reading.