I think any disruption to our comfort zone and schedule can cause us to go off track. I'm sorry you have a new schedule to cope with and about the 3lbs!
I know you didn't really ask for advice but I feel bad with all you are going through.
The easiest thing for me to say right up front is to not buy the chips so you can't be tempted by them! Potato chips call out my name and I'd polish off 8-10oz (a night!) while I was making dinner then eat a whole big dinner afterwards! It was like I never even tasted or saw the chips, it was just habit.
I hope your schedule gets better and you can get some kind of routine back in place soon. Maybe you can use 3FC to turn to when you get home and want to eat. We can be your new habit!!!