Parenting can be extremely rewarding - but it can also be relentless and sometimes, overwhelming. Often the demands of caring for children rub up against work commitments, relationships and the pressure to get everything right. And that's where burnout can creep in. Dr Jo Prendergast is a psychiatrist who is also a comedian, allowing her to bring clinical insight and humour to the challenges of modern life. She's been touring New Zealand with he…