Helen Thomas writes about Graham who lives with one of the world's most mysterious neurological conditions: he has a condition known as Cotard delusion. People with this extremely rare condition believe that they, or parts of their body don't exist. A fascinating, & for those with it - insufferable, insight.
Nine years ago, Graham woke up and discovered he was dead. "It's really hard to explain," he says. "I just felt like my brain didn't exist any more. I kept on telling the doctors that the tablets weren't going to do me any good because I didn't have a brain. I'd fried it in the bath."