I'm probably not going to help you here but.......
I was the same as you, same weight when I first saw your diary, similar height, don't know about age but hey ho!
I fell off the wagon and no amount of trying could get me back on for longer than 3 days and rather than waste money (I still have a weeks worth of S&S sitting taunting me!) I decided that I would switch to cal counting as if I went over on one day I could make up the calorie difference the next. The losses are alot smaller but that's what I have to put up with. I have 2 children and also a childminder and I found I was popping things into my mouth when doing their lunch/dinner/snacks and feeling guilty over a grape or apple :-( I really splurged when I stopped and put on 5lbs but that's nearly off now.
I know if I could stick to S&S for 6 weeks I could probably blitz the last bit of weight I want to lose but my mind is not in it.
If you can I'd keep on going and just be super strict with yourself for as many days as you can. If you need to eat, eat protein or have an extra pack.
I believe you can do and have the willpower to battle on through for the last bit x
Good luck!