MJIM Ok you want practical support...I will do my best
Firstly, how long have you been doing this? A couple of days?? When dieting, it is recommended that you weigh yourself once a week only as it can take a week for any weight loss to show up iyswim - and it stops you getting disheartened as you have done.
Secondly, I don't think what you are eating is enough - particularly not for a breastfeeding woman. I know HC mentioned it before but if you don't eat enough, your body goes into 'starvation' mode and clings onto it's fat.
here is a website which might help. It is not the one I originally mentioned as that seems to have permanently crashed - but you can have a 24-hour trial on this one which would be enough time for you to see what the recommended daily calorie intake is for someone your height/build etc.
Also, finally, you know that it is ok to be a bit wobbly round the edges and I am 100% sure your DH thinks exactly the same.
I hope this helps - it is hard for me to be objective as I would love to be in your position of only having half a stone to lose, rather than the 3 stone that I have!
Ooh that was a bit of an epic - once I got started, I couldn't stop Have a lovely time with your DH and enjoy the break