I lost half a lb this week, so I am now back in the 12 stone range, but only just, am now 12st 13.5lbs.
I feel for you too Tortoise are you still doing lots of walking? school runs, dog walks etc., I only ask because I notice how much fatter I am now that I am not doing the school runs, even walking the dogs is done by putting them in the car and driving to the park, I drop the kids off at breakfast clubs now before driving to work, I used to walk them to school, to the parks etc, I have to make an effort to walk anywhere now, am doing lots of driving instead. Can't wait for the warmer and longer days to get more walking in.
Can just about fit into my jeans now, they are so tight and uncomfortable, and I have a huge muffin top at the front 
. I started back at the gym this morning, I have been doing other classes, but find that gym workouts really work for me, hopefully another couple of weeks in the gym and the muffin top and other areas that I don't like will have disappeared
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Please don't give up tortoise, I think it's just your body getting used to the big weight loss that you had last week, your diet is looking so much better now.