Just a quick post from me. I had GD with my 2nd child, who is now 20 months. I was diagnosed at 16 weeks because I was tested early as there were suspicions that I'd had it with my first child, and also have PCOS.
I adopted a very strict diet and still ended up on insulin, which was entirely due to my condition, not because I wasn't following the diet. So don't be too hard on yourself if you find it difficult to control.
At the time I was devastated, partly due to the rubbish nurse (I hesitate to call her a specialist nurse) who was almost gleeful when she told me that my son would have to go into special care after the birth, which turned out to be complete bollocks.
Still, every cloud had a silver lining and I finished my pregnancy a lot lighter than I did at the beginning. 20 months on, and I'm 5 dress sizes smaller than I was pre-pregnancy.
My top tips:
Bacon, bacon and more bacon for breakfast! My GD was much worse in the morning so I couldn't even eat porridge.
Eat lots and lots of veg, protein and carbs like sweet potato in the evening. Follow the low GI diet for suggestions.
I used to snack on things like cheese and apple together, which satisfied my sweet cravings.
Get as much exercise as you can. It lowers your blood sugar naturally so will help control your GD. I kept this up after the birth as it got to be such a habit.
My son was born via VBAC and was on the 50th centile, so not a big baby at all. He weighed 7 and a half pounds, and my first baby (with the suspected GD) weighed 8 pounds 12 at 37 weeks.