Hi OP. I had GD with both of my pregnancies. It is frustrating, but very manageable. I was diet-controlled so didn't need insulin, and both of my babies were born a normal size with no complications. Neither I nor the kids have had any blood sugar issues since (they test my A1C every year because GD is a risk factor in Type 2 diabetes).
This is a great place to start if you're feeling overwhelmed:
https://community.babycenter.com/post/a50476285/the_new_to_gd_guide
Things not to do:
Do NOT beat yourself up if you see a spike. There is some trial and error at first, and one blood sugar spike will not harm your baby.
Do NOT listen to the posters who say you got GD because you are overweight or you made bad diet choices. 50% of women with GD had no risk factors.
Do NOT feel like you failed if you have to take insulin. Sometimes the placenta just goes crazy later in pregnancy