@OldFan yeh, I think anger can alert you to a boundary that you need to start holding, in the future, even if you haven't managed in the past.
Anger can be the awakening of a new healthier sense of self.
I don't believe (like many others) that anger is automatically bad.
Nobody wants to be angry for decades but if the anger is caused by a recent event I think it's sensible to tune in to that anger and really allow it. That doesn't mean taking anger out on the wrong people before I'm told ''no anger is bad''.
I mean that recognition that you have inside yourself. eg I was treated badly and it makes me ANGRY
I think the answer to that is ''allow that. Sit with it. Be very kind to yourself. Part of self-compassion is not berating yourself for the emotions you feel.
Some of what i learned from therapy is that the solutions to various wounds are to stand in your own corner. my interpretation is that what happened to me would make any reasonable person angry and that I insist that that anger is normal. It is normal to feel angry when you're invalidated for decades.
What's helped me to heal from the wounds of not being heard and the wound of being betrayed is to stand even more certainly in my own interpretation of events. I did that. It definitely made things worse with my family but it has helped me.
Only when I had spent 18 months being certain that I was standing in my own corner even if nobody else was did I begin to feel the anger pass.
And even that is a process. I say begin because I mean begin. It hasn't passed yet.