That's an interesting one Pwincess,
I am familiar with wanting to sabotage myself like that. I have done it for many years with great success. I would stongly suggest you raise it next time you are at your LL meeting. Speak privately to your counsellor first, and if you want to, ask her to raise it at the meeting with the other members of the group. You may be surprised that others feel the same as you.
The questions you need to ask yourself are mostly concerned with WHY you want to spoil your success. Because that is what is happening, isn't it?
We discussed this at our meetings and some interesting ideas came out of it. One of the reasons I get so much out of the group meetings is I get to share others' experiences.
Reasons people may sabotage their successful weight loss might include:-
Fear of being slim because I have never been slim - fear of the unknown.
People might have expectations of me now that I can't deal with - I want to be invisible again.
I cannot deal with the attention from men.
I'll only put it all back on again anyway, I may as well fail now.
Some of these may strike a chord with you, but you might have other thoughts which are just as relevant. In fact, your group members might have, too.
Hopefully, other posters here will have their own insights and will share them here.
Hope this helps.