No, not the popular U2 song.

Instead, the American Idol crooner fell victim to this dizzying disease during a concert The Tilles Center in Greenvale, NY last week.

Ever the trooper, Clay Aiken went on with the show while holding his balance on a stool and giving a perfect performance for his fans, who rewarded him a standing ovation.

As he was assisted back onstage on the arm of an assistant, Aiken sang the All is Well tune from his Christmas CD for an encore ... while both he and fans swooned.