It helps to express it out loud. Anger is felt as energy, aliveness, heat, in the body. If it is only "thought" there tends to be less access, especially as you first learn to explore it.
The "reservoir of rage" that Dr. Sarno refers to, that we all have, is deep. It is so threatening to our identity that it is not easily accessible. The repression is implicit and automatic. Steve might have been aware of resentment, strategizing to get his needs met, ---all kinds of thoughts and feelings which kept him a little on the surface. That is how we are built.
Your good intention to feel your anger, rage is important. Dr. Sarno instructs to "use your imagination to ascertain what your Inner Child probably feels." ---paraphrased
This process for you will simply be a process. You have your good intentions and some practices, and then there is only the effort to engage, and be patient. The results will come.
In my view, the act of asking what is going on down deep, turning yourself in this direction, genuinely wanting to know ---this action has good results. You are sending a signal that the feelings are more free to become conscious. Which means there is less need for repression, meaning less need for symptoms.