Hi op I had gd too and was also on insulin.
Basically you want brown carbs, so wholegrain bread rice and pasta. They break down slower so it means you're less likely to get a blood sugar spike. Protein helps with this so if you eat protein like eggs, chicken, beans etc with your wholegrain carbs it again helps slow the release and helps you avoid sugar spikes.
If you eat too little carbs you actually become more sensitive to them and it can cause ketosis which isn't good for baby. So make sure you're eating carbs little and often with protein to help you slow the breakdown.
Things I ate:
I liked to eat chilli (mince and kidney beans) with a smaller amount of brown rice than normal and salad.
Scrambled eggs and beans on brown toast was my regular lunch.
Turkey burgers with half a brown bap and lots of salad
Bolognese with wholemeal pasta, cheese and salad to bulk it out.
Chicken or fish curries with lots of veg and brown rice
For takeaway I found I couldn't tolerate anything much tbh but I could tolerate a falafel wrap with pickles aubergine Hummus chickpea falafel in a flatbread so that became our go to takeaway.
For breakfast I had Quakers protein porridge with an apple/cinnamon every day.
I found it felt very overwhelming initially because every person tolerates different amounts of carbs and sugar etc and that tolerance can change during your pregnancy. For Example by the end I couldn't tolerate the apple in my porridge.
So it's very much trial and error and trying to think about how you structure your meals so you're pairing protein with wholemeal carbs and then using your bloods to guide you on how much carb to include. I was quite sick as well so when I found things that worked for me I just rotated them every few days and stuck to what I knew worked.