“It wasn't until after the Klitschko fight — a very massive high — that I had to avert to an even worse low. The lowest low that anyone could ever have. I'd wake up and think, 'Why did I wake up this morning?' And this is coming from a man who won everything. Money, fame, glory, titles, a wife, family and kids — everything. But I felt as if I had nothing, a gaping hole that was just filled with gloom and doom.”