There is a meal plan they should have given you to help maintain your sugars etc. My girlfriend had GD and was put on a strict diet. She lost alot of weight on it, but they werent too concerned as baby was growing and doing well. Try not to stress, just watch what your intake is. Your level doesnt seem to be too high so its completely managable
dont worry yourself too much, it is known for women this size to get diabetes, and the doctors must inform you of defects if they can happen your case. you shouldn't worry about your weight either, because it is known that a woman 300 pounds or more should only gain 15 pounds. if you have any concerns talk with your healthcare provider, because your stress and anxiety isn't good for the baby.