Liz,
You are clearly living beyond your means. You have the financial education to know better, so this is an emotional thing you'll need to work out.
The interview sounds promising. A 5K raise is quite good. I think you are assessing the position expecting it to fill all of your economic needs, but that is not realistic. I think you've only been back at work a few years and the opportunity should be judged as a stepping stone. New people, new company, get your licenses back - then see what will unfold...
As for food - Snag your green grocery bags, a quarter for the cart, and go to Aldis. They have turned into a little Mecca of organic and fairly healthy options.