Farah - here is what I do when I feel frustrated. I go to the grocery store, to the meat department. I pick up the one lb packages of meat, or butter, and stack them up to represent how much I lost. Even one lb is a lot when you look at it like that. Keep in mind, that the slower you lose it, the more likely you are to keep it off anyway, and this is more like an endurance race than a sprint!
Keep trying - it's not how fast you get there, it's whether you're moving in the right direction!