Rant....worry

Hi....sorry I need to rant and probably waffle.....
I feel like a fake was diagnosed type 2 a yr ago but due to medication allergies have been controlling with diet only...
I am due to have some surgery in next few weeks but need to be nil by mouth from 8pm the night before and explained this to DN today as I am worried that most nights around 3am I go to about 4 with usual sweats etc so have a little drink and small amount to eat to get me through rest of night ........but obviously I going to be nil by mouth was worried how low it will go as........her reply was just eat some brown pasta (slow release carbs) night before and you should be ok.......so anxious and wondered if anyone had gone through something similar........hope this makes sense as got myself so worked up :-(
I also mentioned the pins needles in feet and hands and she said it was doubtful that it was diabetic related!
And as for getting her to also test my vit d and b12 and thyroid levels she even checked her guidelines for criteria for testing....
Feel left to it and alone.
Thanks in advance

Thank you for the reply.........i am probably just over worried about the 12 hrs nil by mouth( but obviously it going to be more like 16/17 hrs) after the opp and coming round from the anesthic and understand it has to be done to avoid me being sick during the opp.......