I arrived at work on a seemingly ordinary day on Thursday, May 21st, but found myself unable to think or concentrate at all. I felt a lot of nervous energy and anxiety building, but didn't know why. I had also started having cancer-related nightmares in the previous week, as if to predict something rotten coming. It turned out that this particular day was my last two days of chemotherapy, four years ago, and I remember those days all too well.