Ally - maybe I got up grumpy this morning, but so be it, because I'm not feeling much sympathy for your GP here. Frankly, I would say, if you are feeling unwell enough to be calling him, out of the blue, then he surely has a duty of care yo ensure you are well enough to wait until the end of March for your next bloods.
I know I can be a wicked old witch and very grumpy at times, and you are a much gentler soul, it seems, but if you could try drinking plenty to try to help with your sugars a bit, but if you get to this evening and still feel as unwell as you did to make you call your doctor, I would consider calling the out of hours service, or whatever you have where you live.
I'm afraid if I were with you, I would be making a bit of a fuss right now.
What sort of numbers are your bloods running at at the moment?