Billy Joel tells PEOPLE that he is rolling with the punches, months after he was diagnosed with a treatable brain condition. “I know a lot of people are worried about me and my health, but I’m okay,” he says.

Billy Joel has opened up for the first time about the brain disorder that forced him to cancel all upcoming performances and tour dates. The music icon, 76, was diagnosed with Normal Pressure Hydrocephalus (NPH) in May. The rare disease can cause problems walking, which is especially problematic for a performer like Joel.