David Clark asks David McCartney whether he found himself helping others, in the way he was being helped by others, when he was in the rehab. David stated that when he found himself functioning more healthily as a human being, and felt that he had some useful things to share, he did start contributing in a way that could help others.
However, he had to first dismantle the veneer of a doctor identity he was using as a mask and shield. This was difficult at first, as a lot of his self-esteem was tied up with this veneer, even though it was holding him back. He had to stop being a doctor and be a member of the rehab community, and then gain the identity of being a recovering person.