Food Issues After Moving Back In

I had to move back in to my parents house this year after being laid off. I lived alone for several years and made my own meals all week. However my mom will only buy enough food for dinner and not cook any extra because she doesn't want any leftovers. Most of the other food in the house is dairy (cheese, yogurt) or eggs and I'm allergic to both. There's usually sausages and chicken nuggets but I haven't eaten meat in a long time and think it would make me sick. She insists I can just make my own food but im getting tired of peanut butter on toast. (I didn't even eat white bread living alone I had been eating wheat bread for years, but she only buys white bread) My migraines have started to get worse because I can't find food sometimes in the middle of the day other than potato chips. I've started hiding food in my room when I find something I think I might want later and taking naps in the middle of the day because I'm too tired to figure something out. I'm not getting paid again yet so I can't buy much of my own groceries. I brought up that the food in the house doesn't work with my diet but she just got annoyed, and she has been working with me more than when I was younger it's just still exhausting.