I don't know if anyone else relates to this but whenever I'm really anxious, especially when that anxiety is paired with depression, I completely lose my appetite. There have been many days where I barely eat anything if anything at all. It sucks because going the whole day on an empty stomach makes me feel exhausted/fatigued and I can barely function. If I try to eat something I get really nauseous. I don't really know why this happens, I've heard that people overeat when they're anxious but not this.