Ozzy Osbourne has revealed he's battling Parkinson's disease, opening up about his diagnosis in an emotional new interview.The rock star spoke in an interview with Good Morning America that aired Tuesday, saying he was diagnosed with a form of Parkinson's disease after a fall last year."It's been terribly challenging for us all," Osbourne said, though his wife, Sharon Osbourne, described the diagnosis as "not a death sentence by any stretch of the imagination."Osbourne previously postponed his planned 2019 tour dates, citing his health. "Words cannot express how frustrated, angry and depressed I am not to be able to tour right now," he said at the time. He reiterated to GMA that he "can't wait" to get back on the road again. "That's what's killing me," he said. "I need it, you know."Now that he's revealed his diagnosis, Osbourne told GMA "I feel better," adding he hopes his fans "hang on and they're there for me because I need them." Osbourne, who's set to release a new album Ordinary Man next month, also promised, "I ain't going to go anywhere yet."