Sorry about the hard time you're having.
However, even if you eat on the run, you can make good choices. McD's now sells oatmeal, and although I haven't tried it, I've heard it's really good.
As far as bringing the bad stuff along with you to work, why are you buying the bad stuff? If you don't buy it, you won't be able to bring it. So, next time you go to the grocery store, just don't buy the unhealthy stuff.
And be kind to yourself. You're undoubtedly going through a lot of stress right now. Don't anesthetize yourself with food. It makes things worse. I've realized that sometimes it just helps to sit and deal with your feelings, regardless of how much it might initially hurt to do so.
Clothes Sizes (not lbs):