Irish author Marian Keyes has compared her recovery from depression to "coming up from the bottom of the ocean".
The author of novels including Watermelon, Sushi For Beginners and Rachel's Holiday, has said she faced suicidal urges up to 40 times a day in the depths of mental illness.
She battled the depression for 18 months and tried every possible remedy, including medication, cognitive behaviour therapy, meditation and mass and said nothing worked but the passage of time.
She told the BBC: "I had never really experienced anything like it. I stopped being able to sleep and eat, I couldn't have conversations and it accelerated and I ended up going into a psychiatric hospital.
"Suicidal impulses started and it was very hard to physically to stop myself from going through with it, for months and months every day was an enormous effort not to do the acts of wounding myself. That went on for 18 months.
"It's an illness and it ran its course. Three years ago, at the start of 2014, it was like coming up from the bottom of the ocean. It was really speedy. I had always described myself as melancholy or depressive but I hadn't a clue, anything I had before was a blue day by comparison, this was altered perceptions, a mental illness."
Keyes, 53, who has been sober for 23 years, also detailed her recovery from alcoholism in her youth, saydin: "Alcohol was the love of my life. It was my best friend and in the end, my only friend."
She said starting to write was her "rope across the abyss" as she penned her first short story months before entering a recovery program.
"I had stopped eating, stopped hoping, I was constantly suicidal. There was only one way it would go. I couldn't stop drinking and was preparing to go under. One afternoon I was at home when I should have been at work and read a short story in a magazine and thought 'you could do that' and got a pen and paper and wrote my first one.
"It was that primal urge in all of us to stay alive, saying 'I can give you this will you live for this? It didn't get me sober but gave me something to hope for."
She has now written 17 books, selling 22 million copies worldwide but said it is frustrating they are dismissed as "popular fiction" and "chick lit".
Readers seeking support and information about suicide prevention can contact Lifeline on 13 11 14.
Suicide Call Back Service 1300 659 467.
