Glad to see you back!!
Ok, firstly, don beat yourself up over a slip. All is ok, and now you just need to focus on being on track. 10 syns a day over the next couple of days may be a good idea. Honestly, ask yourself how many mini eggs fewer is that? Not many.
It seems as if you've hit that on month barrier and you're relaxing. That's not a bad thing, but you need to keep some focus. You have a goal! And a stone is doable by the end of May. Why not use the next 2 days as a practice, and keep your daily syns at 10 until then?
As for the weight loss envy? Been there. Have seen people on thus forum who are losing loads every week, but there is no way you'd catch me on the Cambridge diet. My mum has done it in the past, lost loads of weight and then put it all back on and then some. You also see people following CD who lose just a couple of pounds a week, at the same time as others on SW like RedRidingHood who has been on it for months and had great losses. She lost 4lb this week!
Personally, I'd stick here and try not to think of this a a diet. That is what will cause you problems. You reach target and think you can go back to normal. If you're not happy with your progress, maybe consider changing something? I am not a crisp fiend like some, but love chocolate and bread. In that vain, I treat the two as real treats. Maybe once a week I'll allow myself something with real chocolate and I find that works. I really look forward to it. I know that this Easter I will allow myself a couple of hot cross buns and syn some butter. Before, I'd have been buying them every week in the run up, and probably have had 2 for breakfast each day. It's all a case of limiting and finding a balance. Maybe you're just not quite there yet? This is a change of lifestyle, and will take time to get in to. I know you don't want to keep a food diary, but at least consider it... I've found it so helpful. And I find that I don't want to write down bad things, so I tend not to eat them!
Hope things are better, and I'm certain that one day's slip won't harm your loss this week!
Xx