Boy, am I glad to see your post! It must have been the date or something yesterday since I had 2 huge bites of peanut butter (the one with sugar in it) as well as a couple of chocolate chips on top. I've decided that peanut butter is my Atkinelles heel...
I know how you feel. Sometimes, this WOE can be so liberating that you can "eat what you want provided it's legal." That's only partially true. Lots of little variations of what's allowed (splenda, caffeine, etc.) can add up, just like you experienced.
Alas, like me today, you are back on the wagon. Until they invent a time machine, you and I can't go back to yesterday and fix it, so here we are, two honest veterans who, believe it or not, are imperfectly human. The difference, though, between *this* time and last time I fell off the Atkins wagon years ago? I'm back on plan today, already worked out, and feel mentally invigorated, notwithstanding the bloat.