I just wanted to put this out there, but for me when I am really anxious I absolutely cannot eat, it hurts to eat and the smell of food makes me nauseous. Even if I’m hungry I will end up going a few days with very very little In my stomach and the pain in my stomach ends up making my anxiety worse. So I discovered today some foods that are gentle enough on your stomach that will give your body the nutrients I needs and hopefully restore your appetite. For me when this happens to make soup or any kind of thick chicken/vegetable broth is extremely helpful or light light breads like a croissant, yogurt as well. And for drinking if cool water irritates your tummy I tried to make just hot water and a bag of chamomile even though I don’t enjoy tea much i put it just to add some flavor. I found it alleviates the pain and helps because most certainly you are also dehydrated. 
Anyway I struggle with this on a weekly basis so I just wanted to share, and see if it happens to anyone else.