I focus on basically a "SANE" diet which is high in veggies and nutrient dense protein and while food fats (fish avocado nuts etc) and some low-fructose fruits (berries and citrus mostly). Low to no starches and sweeteners (stevia is ok).
It made me feel much better after my first pregnancy (even though I didn't have a name for it other than low starch) and this second pregnancy I haven't gained a pound from my first visit but the baby and I are healthy as can be.
Look up carriebrown.com for some great recipes (even some baked goods that are no starch!) and hang in there! You can do this!
I also found that thinking of sugar and starches (which are just another form of sugar) as "poison" for the baby helped me a ton with motivation.