Gail Porter has admitted she was "very, very ill" with depression and now wants to help other sufferers.
The TV presenter and former model, 40, was hospitalised earlier this year, but denied reports she had tried to end her life.
"You kind of think you can deal with everything and obviously I couldn't and it got worse and worse. And instead of actually saying 'Can I get some help from someone,' I thought, 'No, I'll be fine. I'm a mummy, I've lost my hair, I can deal with all these things, it's not a problem'. And I actually just got very, very ill," she told ITV1's Lorraine.
"They said in the papers that I had cut myself, I tried to commit suicide, all of this nonsense. I never did any of that, I just literally was at the lowest, I couldn't see an end to this depression."
The mum-of-one went on: "I was put in a ward behind the Royal Free Hospital and I wasn't allowed out, it was illegal for me to leave. And they put me on all these drugs that I had never taken in my life."
Gail - who began losing her hair in 2005 - now plans to help other people going through similar experiences.
"I'm studying to do counselling because I really would like to help other people," she added.
"I'm at my happiest when I can talk to other people or help other people or do something nice. So many people have actually done it to me, so I would like to give it back. And I really hope that we can get some sort of system together that can help people because there's not a lot of help for people."