Dolly Parton  has cancelled her Las Vegas residency and shared a health update, telling fans that “everything I have is treatable”. The country icon and  most popular public figure in America  had  postponed the run of shows at The Colosseum at Caesars Palace in October , saying at the time that she had been facing several ”health challenges” and would not be able to complete rehearsals in time. In an Instagram video posted earlier today (May 4), she said she had “some good news and a little bad news”. “But the good news is I’m responding really well to meds and treatments, and I’m improving every day,” she said. “Now, the bad news is it’s gonna take me a little while before I’m up to stage performance level, because some of the meds and treatments make me a little bit ‘swimmy-headed,’ as my grandma used to say.” She continued: “I am truly sorry that I’m going to miss all of you that had tickets to see me in Las Vegas.…