Hi, I've just checked an update on bloods taken this week and my vitamin B12 has just gone on line as 'abnormal, to be expected, no further action'. Slightly panicked. I'm on 1000mg of metformin, down from 2000mg 3 months ago. I've had some odd feelings of dizziness recently and a dry mouth and tongue even though BS are 40. Could the two be linked and is that right that my GP doesn't do anything for it.