When the journalist Bryony Gordon wrote about her struggle with depression she was taken aback by her readers’ reaction. In her memoir Mad Girl she recalls: ‘Of all the subjects I had written about in my career, not one of them had elicited a response like this… I received hundreds and hundreds of messages from people sharing their own stories of mental illness. Strangers sent me cards. Friends I had always seen as upbeat and jolly, who had probably always seen me as upbeat and jolly, pulled me to on