I was in the same position, Sarah, but am lucky enough to live near a great store that did it overnight. My dust / whatever was on the sensor because, like you, I was having to use the healing tool on most shots. I'm too chicken to try cleaning the sensor. Sorry my post isn't any help but wanted you to know I feel your pain.
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Linda
My gear: Nikon D700; 24-70mm 2.8; 70-200mm 2.8; 105mm 2.8; 50mm 1.4; 150-500mm 5-6.3
My software: CS5 on a PC; Lightroom 2; ACDSee 12
  
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