Have you by change read any of don Miguel Ruiz's material ? (Author of the 4 Agreements - maybe his most well known book).
He also did a nice little book called The Mastery of Love that I think might be very helpful to you in understanding the root of anger.
And I think that's the key (like so many other things). Once we truly have some understanding of the how and why of things, it often puts them in a whole different perspective. And more under our control.