Hello
@Ciara86 I also had GD and it wasn't picked up until 23 weeks, it explained my lack of energy, sweet tooth etc, I was put straight onto insulin, no dietary advice as such, I felt like I was stumbling round in the dark to be honest and it was a shock to be diagnosed. The issue I had was that my blood glucose levels were feeding my baby so she was born with a high birth weight and I was induced at 37 weeks too for this reason. Apart from this all was fine with my daughter though.
You need more support than 'we'll check again in 5 weeks' so as
@Diakat has said call up your DSN/Midwife and ask for more support.
Try not to worry though, stress doesn't help you or baby, but if you can avoid sugars/carbs etc and replace with protein, veges etc, please let us know how you get on ?