Anyone with gestational diabetes?

Philana • TTC since 2008. Conceived twin girls in 2015 with IVF & delivered at 31+1. Surprise baby naturally conceived 02/17.
I'm on day 2 of my new low carb diet and I feel like I have no energy. I've been craving soda (reg not diet) and today I gave in. I had a small cup and I felt so much better after. 
Any tips to help with energy and sugar cravings?