The injections for the insulin are easy compared to the blood ones, you won't even notice them. With your food just make sure you eat a balanced diet. GD usually goes soon after delivery but they will keep an eye on u for the future x
My sister had this, she had to check her blood regularly and shopping took longer as she had to spend longer shopping because she had to check the ingredients on everything. She found managing it tricky at first but once she knew what she could and couldn't have she found it easy to manage. After baby it went away.