Wiktionary
vb. (present participle of lose it English)
Wikipedia
Losing It: And Gaining My Life Back One Pound at a Time is the best-selling autobiography of actress Valerie Bertinelli released on February 25, 2008, by Free Press.
In the memoir, Bertinelli confesses to cocaine use and infidelity. She also writes about her relationship with film director Steven Spielberg and marriage to rock star Eddie Van Halen. In addition to revealing her past indiscretions, the autobiography focuses on how she became clean, lost weight, and conquered her other personal demons.
Bertinelli promoted the book with an hour on The Oprah Winfrey Show. Losing It spent three weeks at #1 on the adult non-fiction section of the New York Times Best Seller list.
Usage examples of "losing it".
It didn't do for one new parent to let the other think he was totally losing it.
Months ago you put your property out of your hands, boasting that you did so to escape losing it on prosecution for libel.
My dream made sense, but nothing makes sense now, except that I'm losing it.
She thought of her chic apartment in New York and how much she had worried about losing it when she'd lost her job, but she couldn't think now why it had seemed so important to her.
Maybe there could be something real and permanent between them, and she was in danger of losing it because she couldn't stop listening to her head instead of her heart.
He carried his resolution within himself in terror and haste, like something dreadful and alien to him, for, after the previous night's experience, he was afraid of losing it.