I finished the radiotherapy chunk of my breast cancer treatment last week. Cause, of course, for relief and celebration. Unfortunately, I'm feeling particularly sorry for myself. Next, it's hormone treatment, with tamoxifen, the most widely prescribed cancer pill in the world. Given the drug's ubiquity, its workings are little advertised. It brings on early menopause, and makes women realise that, though they are more likely than not to survive the illness, it will leave them fundamentally changed for ever. Sheeesh. Heavy.