Bindi Irwin was told by doctors that the pain caused by her endometriosis was “all in [her] head”. The 24-year-old conservationist underwent explorative surgery last year after battling through more than a decade of pain and extreme fatigue with doctors finally concluding she was suffering from the agonising condition – which causes tissue similar to the lining of the uterus to grow in other places – and is just glad to be able to “laugh again”, especially after medics had tried to write her symptoms off as “hormones”. Bindi – who is married to Chandler Powell and has four-year-old Grace with …