How do y'all eat and sleep?

My ex and I broke up on Sunday because he said he was falling out of love for me. Since then, he's been slowly moving his stuff out of my apartment. I haven't been eating nor sleeping well. I've been eating small bites of fruit, some greek yogurt and some leftovers to sustain myself. I'll wake up in the middle of the night in an anxious, sweaty mess. I also lost passion for cooking, one of my most cherished hobbies. I'm such a wreck and I'm looking for advice, especially from those who broke up with their SO while living together.