I too struggle with the anger. Since it was there, I used it to burn away some of the emotional ties. But it seems to have a life of it's own, I can't let go of it. Because the anger comes from pain, the process of releasing it has to begin with letting go of that.
This is all so difficult. I'm interested to see if your IC helps resolve this quicker, or is it just another stage in this that we must surrender to and endure until it fades away.