In June last year, three months into a prescription for anti-depressant drug Efexor, former financial analyst Tim Hillier left his hotel to wander the empty streets of Alice Springs in an attempt to clear his head. An hour earlier, he had wagered $80,000 -- almost the entirety of his life-savings -- on a first-round Wimbledon tennis match featuring Aussie hope Sam Stosur.

With Stosur faltering in the opening set, Tim knew he should be sick with panic. Instead, the fear just gnawed away at the fringes, relegated to the background by a thick, medicated haze from the Efexor intended to dull his severe obsessive compulsive disorder. "I was walking the streets just thinking 'f-ck, have I actually placed this bet?'," Tim said. "Have I actually wagered all this money on a single tennis match?"