Hayman told Dylan Cleaver's The Bounce that he's been struggling with head related issues since retiring in 2015.
"I spent several years thinking I was going crazy. At one stage that's genuinely what I thought. It was the constant headaches and all these things going on that I couldn't understand," Hayman said.
Those thoughts and symptoms led to Hayman abusing alcohol, having suicidal thoughts.
He ended up receiving a suspended prison sentence in France after admitting to charges of domestic violence.
