Idealperson: 
That's an incredible accomplishment and you should be on that cloud. As for advice, the only thing I can add to Melissa's comments is to get regular exercise. I can't count the times that my workouts have saved me from a gain.
Please join our ongoing chats. Right now, some of us are a few pounds above goal and are in the midst of a mini-challenge. Others are in full maintenance mode, but we all manage to support each other, no matter what our weight objectives.