sybil - what people often find with low carbing (as have you) is that weeks 1 and 2 see a big loss. In weeks 3 and 4, typically, this will slow right down or even stop. I think it's to do with the body shifting to burning fat rather than carbs, and probably a bit of 'catching up' - it's really easy to panic at this stage and think it's not working any more. And it's even easier to get depressed about it and have a huge 'Fuck It' moment, and fall face first into pasta, pizza, chocolate, cream cakes ...!
For it to all continue to work, you need to make sure that you don't do that, and you keep going - and then weight loss will then continue after that. But it will be at a much slower rate (which will, long term, be much more sustainable)