Overeating and vegetarianism?

I have been a vegetarian (almost vegan) for a little over a year. I am so for ethical reasons, and try to eat very well. No sugar, no white flour, no coffee, lots of flax seed, all whole grains, low fat, at least a pound a day of veggies, etc. I generally love the food I am eating, and get at least 80 grams of soy/vegetable protein a day, but I have to say- and I hate to say it- that I have gained a good twenty pounds since going veggie, and I am still constantly hungry. I am also hypoglycemic (this has been since before I went vegetarian), and ate just a little fish last week to see if it would help my hypoglycemia. My constant hunger disappeared for a good two days afterwards. I'm concerned at this point that the weight gain is affecting my health. I realize high-protein diets/Atkins are not the way to go, but I'm taking in about 700 grams of carbs a day, and that isn't terribly funny either. I'm 5'1", there's no reason I need that much. Any advice?