Kerr says she was misdiagnosed when she first started feeling sick. Photo: Pierre Tostee//World Surf League
 
      Eighteen-year-old phenom Sierra Kerr announced that she has been battling…

Kerr says she was misdiagnosed when she first started feeling sick. Photo: Pierre Tostee//World Surf League
 
      Eighteen-year-old phenom Sierra Kerr announced that she has been battling…