This forum is filled with relapses. So one thing to reassure him is that he is far from alone. The way you describe it, he may himself be coming part of the problem. It is a natural thing for us to zero in on symptoms, get locked into thinking patterns, and become anxious. Anxiety is possibly enemy number one for PCS sufferers. This is my whole situation, suffering from an anxiety disorder which I trap myself in with increasingly obsessive bad thoughts which fulfill themselves ever easier.