Gestational diabetes

hi all, I was diagnosed with Hba1c level of 6.5 in may 2016. so I got my diet under control and exercised hard to get it reduced to 5.5. However again I lost the track and my levels rose to 5.9in may 2017. Presently I am 8w4d pregnant and the only constant symptom I have is hunger-i always want to eat something no cravings at all, else I'm getting too much tired. my doctor put me on strict diet but I'm unable to follow it. it's so hard and I feel guilty for eating. but trust me i try to eat healthy and in limited quantities. also I'm vegetarian. I feel like I'm getting into depression and not able to love my baby. please help me😓