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NEW YORK (AP) --

Susan Boyle says sudden fame hit her like a "giant demolition ball."

The Scottish singing sensation tells NBC's "Today" show, in an interview to air Wednesday, that adjusting to her overnight celebrity has been difficult.

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Her first appearance on "Britain's Got Talent" earlier this year had millions of YouTube hits. After placing second on the TV competition, the former church volunteer was hospitalized for exhaustion.

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When asked if she felt overwhelmed by fame, Boyle says: "It's a lot like a giant demolition ball." Boyle says she had to wrap her head around the experience, but is glad for the opportunity to have a professional singing career.

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Her interview on the NBC morning show was taped in London last week.