When I am stalled.....

It is so frustrating when I am stalled. I was hoping that I would lose some last week when I was doing my training for my job, but that didn't happen. I gained and then lost this week, but didn't lose anything extra. I actually start working tomorrow and it is a 12 hr shift. I am a little concerned because I cant take my own food and I am sure that many of the meals they make are high carb. I don't know if I can do 12 hrs without food. I am going to eat my eggs before I go so that should help some. I need to figure out something that will keep me feel full.