As the general election approaches, Claudia Hammond finds out who is saying what about mental health. She talks to BBC health care and social affairs analyst, Emily Craig, who has been through the parties' manifestos. Claudia meets Matt Haig to discuss his new book, a surprise bestseller about his recovery from depression; and psychopharmacologist, Val Curran talks about her drug trial to tackle cannabis addiction using an ingredient found in the older versions of the drug, cannabidiol. And psychologists from Ohio have been trying to find out why paracetamol can blunt both positive and negative emotions. Do physical and emotional pain share the same brain systems?