Céline Dion has no idea when she will be able to get back to touring. The ‘My Heart Will Go On’ singer, 55, was left devastated when she was diagnosed with ultra-rare Stiff Person Syndrome, and was forced to cancel her European tour in February 2023 due to her ongoing battle with its symptoms. She told the latest issue of Vogue France when asked if she would be back on stage: “I can’t answer that… because for four years I’ve been saying to myself that I’m not going back, that I’m ready, that I’m not ready. “As things stand, I can’t stand here and say to you: ‘Yes, in four months.’ “I don’t kno…