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The popstar has revealed that he is battling a life-changing illness that struck him down four years go and he mistook for depression.
Robbie who recently got married has said "I thought I was lethargic and depressed as a person. I thought that was my make-up,"
"I found out a few months ago that I'd been ill, completely by mistake, and I don't want to go into the whys and wherefores but what I had made you lethargic and made you depressed and I'd had it for years and not known and I'm on treatment for it."