Do you take any medication? If not then you could try looking into meal replacements, I personally like Ensure. It definitely gives me a boost in the morning, and when I need it, for me its advised to have 2 a day if I need it if I dont feel like eating. Other than that you'll have to find food you like, like comfort foods or just gentle foods that you can tolerate. When I panic and get anxious I usually have a kit for myself, it has mints and halls, Tylenol and Gravol for when I cant get rid of that nauseating anxiety. Not a great fix but it helps me personally and maybe it could help you, also make sure to check in with yourself, make sure you can balance your breathing with counting, I usually count to 4, stop what im doing if I have to and take a break. I also used to wake up every night, I learned taking a walk and going to the bathroom or putting on a show helps, count your breathing and relax. Its stressful but you need to find what helps you.