C.K.
Wow...theres an "I want" if I ever heard one...welcome to motherhood. Gestational diabetes is not an "except", it puts you in the high risk pregnancy category. Maybe talk to your doctor and find out exactly what the risks for you and the new baby are. Sometimes as mothers, taking care of our bodies(this includes our mental health), is the first step in taking care of our kids. What is better for your daughter? A full year of breast milk with a mom who's over tired and or worse, or a healthy mom who did the best she could given the circumstances. Make no mistake, 9 months of breast milk is great. If that's all you can do than you did very well. The most important thing you can do right now is take care of yourself in order to take care of your new baby.
Sorry if this sounds harsh, but sometimes we need to hear it.