Having a tough time

My pregnancy was going very smoothly, I always joked I didn’t even feel pregnant until I hit the third trimester and was diagnosed with gestational diabetes almost two weeks ago. I don’t meet with the nutritionist and high risk doctor until Monday but they had me pick up a glucose meter and start a diet and tracking my sugar levels. I’ve been really depressed ever since finding out. I feel like I have no direction right now since I haven’t met with the specialists yet. I break down every time my levels are high, I follow the diet. It’s extra tough because my baby is in the 10th percentile. She’s very small so for the first two trimesters they told me to keep eating carbs and literally to have a milkshake every day...and now I’m eating what feels like bird food. Anyone else going through this? Feel depressed? Just want to eat something that tastes good? Ugh. I know there could be so many worse things, I’m just really struggling right now.