Healthy people, I have concluded, including myself, do not understand how everything changes once you have been diagnosed with a fatal illness. How you cling to hope, however false, however slight, and how reluctant most doctors are to deprive patients of that fragile beam of light in so much darkness. Indeed, many people develop what psychiatrists call ‘dissociation’ and a doctor can find himself talking to two people – they know that they are dying and yet still hope that they will live.