A US magazine claims that the exhausted actress is suffering from debilitating headaches and dizzy spells that could result from chronic stress or hard dieting.

Star cites a recent L.A. lunch date when Katie looked pale, feeble and emaciated, and was so disorientated when she left the restaurant that she “braced herself against the doorframe before her bodyguard carefully guided her into a waiting SUV.”

Sources tell US magazine that extreme dieting and her hyperactive husband may be the reasons:

"Katie doesn't get enough sleep - and hasn't for months now," says one insider, "She's tired and drained much of the day because Tom is so wired, and they stay awake until after midnight. He has boundless energy, and she just can't compete."

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Meanwhie, Katie Holmes is reportedly in final negotiations to star in a musical on Broadway.

Tom Cruise’s other half will appear in the Arthur Miller play "All My Sons" alongside theatre veterans John Lithgow (also known as Dr. Solomon from "Third Rock from the Sun") and Diane West if the show does go ahead.

Producers are hoping that the 29-year old will bring some sizzle to the box office and put Katie back on the acting map after her recent string of flop movies. 

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