Here are a few resources and tips:
http://www.plus-size-pregnancy.org/gd/gd_index.html
(SO much info. on this website)
"The pH Miracle for Diabetes" by Robert O. Young
http://www.amazon.com/pH-Miracle-Diabetes-Revolutionary-D...
Cinnamon helps keep blood sugar more stable. Add it to anything- oatmeal, ww toast, etc. Also, Stevia and Xylitol are natural sweeteners, which are good for blood sugar and for overall health (and teeth-xylitol). Much better than other alternative sweeteners, ie. nutrasweet/splenda/etc, imo.
I always did open-faced sandwiches to use less bread or lettuce-wrapped. Peanut butter (the kinds withOUT corn syrup or other garbage) or raw almonds always helped keep levels steady or evened out a higher-carb snack.
I had GDM in my first pregnancy with my OB/GYN, but with my 2nd pregnancy I had a CPM (midwife). She seemed to care more about it than my OB (I had to remind him I was gestationally diabetic each visit as he was walking out the door, show him the charts I'd been keeping, as he waved me off, telling me I was fine, perhaps bc I'm not overweight and the ONLY risk factor I have for diabetes is genetics.) My midwife educated me about it much more than my OB ever did. I kept food journals throughout much of my pregnancy, mostly for my sake after the first month or so, to keep me more diligent in eating well and staying away from all the tempting no-no foods. I wasn't a regular/typical case, but was able to keep the sugars down through proper diet (lots of salads with protein, water, several small high-protein meals a day), exercise, water, rest, and education. I learned not to buy anything that would tempt me at home.
A few breakfast ideas that worked for me in keeping my blood sugars steady included (but definitely not limited to):
Breakfast - 1/2 ww English muffin with 1-2 eggs, omelette w/ cheese, ham, veggies (basically anything eggy...protein), or small bowl of oatmeal with cinnamon and some pb.
I was even able to eat occasional desserts, especially if I spaced it a few hours after a meal and combined it with a protein. Not every day, but enough to help me feel not completely deprived. Of course, everyone's different and what worked for me might not work for anyone else.
Best of luck,
N.