The former 90210 star is said to have hit a low point after people hit out at her for calling Katie Holmes ''plastic'' and accusing the actress of not being able to sing in her new memoir Spelling It Like It Is.
The wave of criticism directed at Tori resulted in her being treated in hospital for "anxiety".
A source told RadarOnline.com: "Tori was hospitalised for stress and anxiety for a few days because she was receiving a lot of negative feedback about revelations she made in the book and she had no anticipation that it was going to hit a nerve.
"Tori didn't think making comments about a chance encounter with Katie Holmes would cause such a ruckus.
"She just grew very anxious about having to defend her actions in the book in media interviews and decided that she needed to go to the hospital."
Tori - who has been busy promoting her new book - has since recovered from her problems and is now "fine".
Another source told RadarOnline.com: "She just wasn't feeling well and went to the hospital, but everything was fine.''
In the tome, Tori - who has four children with husband Dean McDermott - described a chance encounter with Katie, 34, at voice coach Eric Vetro's office.
The 40-year-old actress wrote: "As I sat waiting outside his music room, I heard his prior appointment working with him in the other room. It was some actress singing horribly off-key ... That made me feel better. I heard him say goodbye and then the actress walked out of the room. It was Katie Holmes.
"I didn't know whether we should hug or shake hands. But the signal from her was immediately clear: Don't even come close."
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