Depression is big business. And we’re not being facetious here – there are drugs companies, medical professionals and self-help gurus all around the world making their fortunes from other people’s suffering. But it’s also very real, and an agonising struggle for the millions of people who struggle with it every day. It’s a growing problem, too, especially among young men. Suicide is the biggest killer of British males under the age of 50, with 100 taking their own lives every week.