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Rachel,
two years ago my GP gave me B12 shots, even though my B12 was around 500 with MCV around 100-101, ... I was tired and dizzy; he said that I am using a lot of B12 so I needed a little extra. In fact it helped some for the fatigue, but then I started a rash.. It did not bring the MCV down however.
Red cells seem to have about 120 day life cycle normally, so the red cell that plops into the blood stream should stay there another three months. Consequently things do not happen normally so fast in that realm. As opposed, white cells can fluctuate within days or hours, as I understand.
Good luck!
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