Munchy - thats tough and I know how you feel as I am a comfort eater too. Have you considered seeing an acupuncturist? Not only do many of them have experience in fertility treatment and helping with conception, they can also help with eating problems. There are points they can do that can help with cravings (not just for eating but for smoking etc). If you do go to one, just make sure they are properly qualified.
Otherwise some of my friends have been to Sureslim clinics with good success. (I havent personally been to them though)