Life with Tom Cruise is finally getting to Katie Holmes, according to a sensational new report.

A US magazine claims that the exhausted actress is suffering from debilitating headaches and dizzy spells as a result of her marriage.

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 the mag that extreme dieting and her manic husband may be contributing to her ill health.

"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."

Sources also claim that Tom disappears for days at a time, without telling his wife where he's going.

"His rule is 'You can be with me, but don't ask about it,'" says a source.