Tommy Hilfiger’s daughter Ally chronicles her painful struggle with Lyme disease in her new book, “Bite Me,” including when her designer father forced her into Silver Hill Hospital’s psychiatric acute care unit after she suffered a nervous breakdown.

“For about a month I started to unravel and it was basically a psychotic breakdown caused by the Lyme disease entering my brain and the stress of the TV show [MTV’s 2003 “Rich Girls”] and parents divorcing,” Ally told Page Six. “He [Tommy] didn’t know what to do. I couldn’t even function. It was crazy, it was so intense.”

Ally, who was misdiagnosed for 14 years, writes that her father flew home after she called him asking for help. When he got there, she writes in the book, “I was still very angry with him. I kept telling him that I was sick . . . He wasn’t getting the message. I got out of bed, grabbed a silver tray off a table, went into the bathroom, defecated on it, and handed it to him. ‘You gotta get this tested,’ I said.”

She explains, “I knew there was something physically wrong with me and that no matter how hard I screamed, no one heard.”

Tommy then brought her to the hospital. “I cried myself to sleep, wishing that I would wake up in my own bed, away from all this physical and emotional pain,” she writes. Ally went through the hospital’s addiction recovery program, and also met with Dr. Ellyn Shander, who correctly diagnosed her.

Ally, who says she now feels good but is continuing “maintenance” treatment, calls her reality TV stint her “worst nightmare” and “the polar opposite of what I had hoped the show would be.” The show painfully chronicled her and her friends’ extravagant and ridiculous lifestyles.

As for her infamous dumb quotes on the show, she explains, “I had full-on Lyme brain and didn’t even know it. I started to say things that I knew were incorrect but couldn’t stop, like, ‘My dad invented cargo pants.’ What? What the hell was I thinking? That ended up being one of the main things people like to make fun of me for saying.”