Fixing it now: Since you said that you aren't having any trouble with hunger today, just eat whatever, whenever you like. Can you eat chocolate? What about maple syrup, potatoes, eggs, oils, fatty meats, rice? All that stuff adds up pretty fast, ya know.
Prevention: If you wanna bring food to work, why not bring some fruit, hardboiled eggs, or even some jerky (if you can eat that, idk.) My fav thing to eat after dinner is yogurt. It's like a dessert! Yocoa FTW (yogurt + cocoa) lol. The restaurants near your job, though -- isn't it difficult to get gluten-free stuff? Maybe since you live in Cali, and they're all super trendy or whatever, they probably have a whole GF section. paki curry sounds awesome!