My experience was pretty similar to all these previous posts. I had GD diet controlled with my DS he came 10 days early, but was 2750 so not big at all really. he was with me most of the time only taking him for the heal pricks I think every three hours, he had good readings each time and within 24 hours they stopped doing them. I was told to try to express and store in syringes in the fridge. It was a hard task but I managed a few syringes of around 1.5mls. newborns don't need much to fill their little tummys so that was enough to get us through. I was pretty adamant that I did not want formula at all if possible and that I wanted to BF only. the syringes worked a treat. Be strong, it is your bub and the midwives don't really care what happens to you after you leave, make sure you make the choices that are right for you and your bub.
Good luck! and congratulations on your pregnancy.