Gestational Diabetes and Frustrated! 😖

So I was diagnosed with gestational diabetes last Monday. Saw the nutritionist on Friday. Since I found out I have modified my diet and started working out more frequently. And since Saturday I have been eating the way they told me, test my blood 4X a day, and have been exercising daily. My numbers however have been all over the place, fasting is always high 95-99, and my levels after I eat have ranged from 109-154. I'm so frustrated because I feel like my days are consumed with what to eat and when, and I am trying so hard to do the right thing and it's not working. Any one else going through this??? Any tips on what you ate, I'm already over eggs, chicken, and string cheese. 😫