Sarno actually recommends going to a psychologist and talking about your emotions as his number one prescription.
But you could try to just "do it yourself" by learning to recognize and give yourself permission to actually feel your emotions. Ask yourself if you are angry, frustrated, irritated, annoyed, afraid, anxious, hurt, or upset in any way. Because it is these kind of "negative" emotions are the ones that tend to manifest themselves as pain in your body if you ignore them for too long.
Then let yourself just feel that emotion for a while. Really just sit with the emotion and don't get distracted by thoughts. Just feel it. And then after you are sure you have felt it as strong as you can feel it, then you try to think about what might be causing it. Really articulate it well to yourself in great detail. What exactly happened at the moment that the emotion started, who was there, what did they they do and what did you do? And then try to name the emotion. Put it into words what it is you are feeling. And then the last step is to ask yourself what you have learned from this situation. If you could do anything differently or see things differently when a similar situation happens in the future.