Lady Gaga knows what it is to suffer for one’s art. While performing earlier this month in New Zealand, Lady Gaga was overcome and almost fainted; during “Bad Romance” the singer literally laid down on the stage. About a month before that Gaga postponed two U.S. dates due to exhaustion, and is said to have collapsed before a show in Indiana, admitting to feeling dizzy and “having trouble breathing.” When asked about her performance...