Stay away from carbs and sugar as much as possible. Did your doctor schedule an appointment for you with a nutritionist? They will be able to help you with the diet. I followed my diet strictly and my DD is now 11 and perfect. :)
This is my 3rd baby and i have had GD with every single pregnancy and i have had to give myself insulin and all.... its not so bad just follow your dietplan and you will be just fine the only thing that has happened to all my children my daughter was 9lbs 11oz my son was 8lbs 13oz and he was born at 37 weeks even now with this baby im 29 weeks and the baby is already 3lbs 13oz
I had it at the beginning of my pregnancy. Im about 33wks now so its not so bad now..but just changing your diet can be hard. But it'll be better later. Try drinking low fat milk 1% or no fat. Try not to eat any spices, pepper especially. No chocolate (hardest part for me). If you aren't already doing so no caffeine. And easy on the dairy.
Try salads with chicken or fish and lots of fruit. If your good with your diet you'll pribably be able to eat normal soon enough. Good luck