I'd second spaghetti squash, which I've used in spaghetti, but also in a low carb turkey tetrazzini.

Other suggestions:
-veggie lasagna using zucchini and eggplant instead of the pasta layer.
-cauliflower as a rice substitute (process in 1 second bursts in a food processor when raw, then nuke for a few minutes until cooked)
-farmer cheese and yogurt for breakfast (we make our own yogurt that's cooked a full 24 hours to consume the maximum lactose, but some Greek yogurts are also low carb) topped with pecans, flax seeds and a little honey
-watch the low carb bars, because many use sugar alcohols, which can still hit you glycemically. Best Atkins ones are the daybreak line.
-coconut oil is good to cook with, and seems to have a positive effect on blood sugar levels.
-for supplements that can help regulate blood sugar, look into CLA, holy basil, cinnamon, alpah-lipoic-acid, and biotin.