Eating less on days I work

I think it's hurting me because I didn't go down in weight (Been going down a steady like .2lbs a week, give and take of course) since I started this job I either don't eat, or I eat crap (Love my French Fries with Gravy and Cheese for my lunch with a Rockstar or Amp as a drink.) I work at a convenience store, and I don't have a break, is anyone else having the same problems? It sucks because bringing lunch to work isn't an option for me right now so I have to eat what the store has to offer.