“During the course of 2006-07, I was coming to the end of a professional career which had lasted 25 years, so quite a long time and unusual for sport.
“I was feeling pretty down about it all, but I wouldn't say I was depressed… but I went to see a couple of clinical psychologists and in some ways, they helped.
“I remember them saying a lot of professional athletes feel like this, which really doesn't do you any good knowing someone else feels like that, as it doesn't make you feel any better.
John described depression like being layers of lasagne with the layers adding up and eventually people feel depressed.
“You’re not depressed to start with, you might be down in the dumps about it or have trouble dealing with it or accepting it, but eventually it leads to depression.
“It did with me – it was dreadful. It was the most debilitating, frightening, awful thing that I've ever had anything to do with.
“Plenty of well-meaning people say to you to pull yourself through or to get on with life. However, when it gets a hold on you, it’s very difficult and you certainly can’t ignore it.
“I ignored it for a very long time, but it gets more and more of a hold on you. You can’t ignore it, you have to do something about it.”
John’s advice to people who are concerned about their mental health is to speak to a doctor about how they’re feeling.
“GPs are like mechanics – there are good and bad ones, so if you get a bad one, keep looking for a good one.
“A lot of people are anti-medication, but you've got to do what you can do to get better. In my case, a particular medication helped me quite a lot, but I had tried others.
“The bottom line is you've got to seek some help."