UGH.  Another celebrity has a suicide story.  Hearing about these sorts of things really makes me sad.  J.K. Rowling admits that there was a time in her life when she hit rock bottom.  Her daughter was what motivated her to get help. 
On desperate circumstances, friends paying her rent:

"We're talking suicidal thoughts here, we're not talking 'I'm a little bit miserable.' Mid-twenties life circumstances were poor and I really plummeted."

On getting help:

"The thing that made me go for help was probably my daughter. She was something that earthed me, grounded me, and I thought, this isn't right, this can't be right, she cannot grow up with me in this state."

Rowling isn't scared to touch the subject and hopes that if she does it will encourage more people to get help too:

The funny thing is, I have never been remotely ashamed of having been depressed. Never," she says. "I think I'm abnormally shameless on that account because what's to be ashamed of?"

By the way, it was during the time period that her friends were helping her pay her rent that she began work on the Harry Potter series, which is now a $14 billion dollar industry.  I bet she paid her friends back and then some!
I'm so glad she's O.K. now...