Hi River-
I've had a little of that too, for similar reasons - new job, on the road, not planning as well as I should. I haven't had anything too awful (nothing high sugar) but not the choices I need to make.
If you're having cravings a few days of Phase 1 should do the trick. Some things to think about - how long were you on Phase 2 before this, how much off plan food did you eat (sugar, processed grains, high glycemic), and are you experiencing cravings again? That will help you figure out how long you need to be on Phase 1. You may not need the full 2 weeks again, a few days may do the trick.
You did what I think is the single most important thing we need to do. Instead of wallowing in "failure" you identified what you were doing and why then you made the decision to get back on plan. You thought about what you need to change and you are doing it. Congratulations, you are already learning to maintain your loss! Welcome back