Gestational Diebetes

I found out I have gestational diebetes early in pregnancy maybe 7 or 8 weeks in. Yes I know its early. I am African American with a high BMI. I started out weight 215 in pregnancy now I am at 198 with a strict low carb low sugar diet from my dietitian. I'm now 15 weeks and taking metformin twice a day and my levels are still high. I start insulin today. Starting out once a day depending how that goes it can lead to with meals :( and I'm beyond frustrated. This is my first pregnancy and I want to enjoy this. I'm having a boy and I'm excited but I get so down and frustrated with gestational diebetes. So much can happen to the baby and I'm terrified.