What IS the mysterious illness affecting Celine Dion, as the singer bravely releases film of an agonizing attack… and who is at risk?

In the terrifying clip, Dion, 56, is seen gasping for air, and wailing in pain unable to control her own body as medics are seen to desperately alleviate her agonizing spasms as a film crew silently watch on.In the terrifying clip, Dion, 56, is seen gasping for air, and wailing in pain unable to control her own body as medics are seen to desperately alleviate her agonizing spasms as a film crew silently watch on.Read MoreHealth News | Mail Online