Seth Rogen may be known for his stoner vibe and comedies such as Superbad and Knocked Up, but behind the scenes the actor, writer, weed-lover and pottery fan has also become a producing power player. The US stock market is spooked and Trump’s henchmogul’s companies are floundering – has the great dealmaker been building up the wrong nation? And Philippa Perry advises a reader: ‘That voice in your head telling you that you’re saying the wrong things is not telling the truth.’