A couple of days later, I got off the tube and climbed the few steps to the top where I had to rest. The thought had crossed my mind that maybe I should call an ambulance, but I didn’t, and carried on to work. That evening I got home from work and listened to my answer phone messages. It was the doctor telling me to go straight to A&E because my haemoglobin (Hb) was 5.2 grams per decilitre (anything below 12 is considered low). I had no idea what this meant but I called a cab and, strangely, I felt a sense of relief after being told that something was wrong and that I wasn’t going mad. I went to King’s College Hospital and no sooner had I sat down, my name was called. I remember thinking this seemed odd as lots of people were before me. Before I knew what was going on I was lying on a bed with monitors attached to me and the tests began.