by Gabrielle Fagan

For more than 30 years, Mark Austin has covered some of the biggest news stories in the world for ITV and now Sky, and witnessed first-hand some of the most significant events of our times while working as a foreign correspondent.

But the 60-year-old father-of-three, who lays bare his experiences on and off-screen in his autobiography, And Thank You For Watching: A Memoir, reveals his most traumatic experience was far removed from war zones. It took place at home, watching his eldest daughter, Maddy, battle to survive the eating disorder and mental illness anorexia nervosa. At her lowest point, she weighed only five-and-a-half stone.

Here, Austin, who lives in Surrey, talks about the experience.

What event has most shaken your world?

Undoubtedly, the toughest personal time was my daughter, Maddy, suffering anorexia nervosa. It nearly killed her. Her illness began in 2012 when she was 17 and lasted three years. At one point, I was convinced I was watching her slow, inexorable death. You experience a lot of terrifying moments when you cover wars, but that was the most shocking personally because it involved someone so close to me.

How did you cope during that time?

I still feel guilty that I didn't understand what was happening, or that it was a mental illness. At first, I thought it was just a teenage fad and kept telling her to "grow up" and to eat.

It was very difficult for several years and almost tore our family apart. I worked, because it gave some sense of normality in the middle of a nightmare and was a distraction, but I don't know if that was the right thing to do. I didn't know how to handle it all. You couldn't communicate with Maddy because anorexia had its hold over her, controlled her, and was like a sort of demon within her. I feel so guilty for telling her at one point, "If you really want to starve yourself to death, get on with it." That came from complete desperation, frustration, being at my wits' end and just wanting the whole situation to go away. It's a great relief that she's now at university, healthy and happy, and I'm incredibly proud of her for talking publicly about the illness.

How has the experience changed you?

I've consciously made an effort to worry far less about day-to-day little things, which has come about partly because of Maddy's illness. I used to waste worry on the small stuff of life, whether I was going to miss out on covering a story, or being in the right place to report an event. I know now that every now and then big things will come along when you really have to be strong, and they are what's really worth worrying about and concentrating on. The rest, you can't control and doesn't really matter much anyway. My wife, Catherine, a doctor dealing with life and death on the front line in A&E hospitals, has always been very good at grounding me whenever I've got stressed about work over the years.

What was it like writing the book?

It was very upsetting at times, but cathartic in a way to revisit memories of what I'd witnessed over the years. At the time things happened, I was lucky I was able to mentally file away in a box the bad stuff I saw. The only exception was the Rwandan genocide in 1994, which was horrific, and as a father of young children it was even harder seeing children suffering, maimed or dead. I know reporters who still experience nightmares and flash backs of that time. The book proved to me that I hadn't processed a lot of what I'd seen, and I think it's been good for my mental health to finally do that. Frankly, viewers only see a tiny percentage of the sheer horror and dreadful things, because you have to self-censor on grounds of taste and acceptability.

You've been in some very dangerous situations - what's kept you safe?

I survived, or at least have so far, largely due to an innate cowardice. I've found cowardice is a much better protection than any amount of flak jackets, helmets and armoured vehicles. I'm not a naturally brave person, who likes covering wars and gets an adrenaline rush from it, so I decided early on I'd take risks but they'd be calculated. Sometimes, of course, you get it wrong, and my biggest mistake was in Bophuthatswana, South Africa, in the months before Nelson Mandela was elected. There was rioting and violence, and at one point I was marched into a field with a gun pointing at my head. I thought, "What on earth am I doing here? I must be mad. I'm going to die."

And Thank You For Watching: A Memoir by Mark Austin is published by Atlantic Books, priced £20.