Anger is part of the normal feelings that one has when one has had a significant loss. But, it is more than that. I reflect on that in my book, "Lose, Love, Live: The Spiritual Gifts of Loss and Change."
"Being in touch with our anger and fear and anxiety is a vital part of growing spiritually. To grow spiritually requires centering our lives in that which can sustain us in the midst of the changing world around us. Spiritual strength is the ability to stay on course even when the winds of threat and fear would knock us off. If we are in touch with our fears and our anger, then we are more aware of what we are putting our trust in. To trust our souls to those things that can be taken from us is to be vulnerable to manipulation by the powers that would control us. To trust in the energy of life that creates and re-creates us, ever calling us into a new world, is to be defined by that which has eternal qualities."