First of all -- CONGRATS on the loss you have had already! That is awesome!!!!
Now, down to business -- just as Crzy said -- you can only take it one day at a time, one step at a time. We've all been in the situation where we've had a bad day and made bad choices and instead of stopping ourselves THAT day it's always "well, I'll just eat better tomorrow, I've already been bad today so now it's okay to be REALLY bad." Not true... stop in your tracks and just because you falter doesn't mean you have an excuse to continue rolling down the hill. [I'm speaking to myself here too.] When you recognize what you're doing, try to be aware of what triggered it and not just the actions, but the emotions behind it and why you aren't dealing with them. You obviously know what works if you've had success thus far. Make a commitment... stick with it.
Even small choices throughout the day are better than NO choices at all. Instead of parking close to the store, park at the back of the parking lot and walk a little further. If you're going to get take out choose grilled or a salad instead of fried. Choose a fruit side vs. french fries.
YOu have this girl, you just gotta get back on track.
I saw that someone had posted or has in their signature something along the lines of.... is the instant gratification of eating what you WANT now better than the gratification of weighing less tomorrow? No, you'll just be beating yourself up later.