You are still constructing the perfect thing you should have said. You have built it forty times now and it has not once been delivered.
Anger is what self respect sounds like when it has been ignored too long. It is telling you where a line is. That is information you did not have before.
Do not send anything at this hour. Write it if you need to. Read it at nine and decide then.
Anger is what respect for yourself sounds like when it has been ignored too long.
It was unfair. You are not exaggerating. Being right about that does not fix it, and both of those things are true.
You are prosecuting yourself with information you did not have at the time. That is not fairness. That is just cruelty with hindsight.
You did what you knew how to do then. You know more now. That is the whole mechanism of learning and it looks like this.
Formless anger is usually grief that has not been allowed to be sad yet. Anger is the easier one to feel.
Anger is often the second feeling. Something else came first and got skipped. Look for the one underneath.