Gestational Diabetes

Hi all, I am now 33 weeks and having Gestational Diabetes which my doctor advised me to control my diet. I have alrd tried to control my diet by having no carbs most of my meal. But sometimes too hungry and when I ate half bowl of rice for dinner , my blood sugar won't lower down making me unable to sleep peacefully at night?. Feeling down by this problem thinking how it might affect my unborn child. Anyone have experience in this problem? Do you think I should ask my doctor for insulin injection?