LONDON (Reuters) – British singer George Michael has canceled his tour of Australia due to "major anxiety" brought on by his recent battle with severe pneumonia, he announced on his website. The former Wham! frontman said that he would complete his Symphonica Tour dates in Britain in October before seeking treatment. He had been due to open in Australia in Perth on November 10 before performing in Adelaide, Sydney, Melbourne, Brisbane and Hunter Valley on December 1. "I have … announced the cancellation of the shows in Australia which breaks my heart," Michael said in a statement. …