Here. My cat is very cute and she's the light of my life whenever I have to spend yet another week existing with my family. 100% unproblematic. She does her pooping and peeing in the litter box, only meows when she wants you to open the door, and doesn't even complain if you stick your face onto her stomach.
That aside, though, I understand that sense of emptiness from compassion fatigue... Do try to take care of yourself as in eating enough, drinking plenty of water, and getting as much rest as you can. Taking a walk is sometimes physically a drag, but it's at least an experience different from sitting down and feeling empty. Perhaps get some snacks you like? Sometimes, I make getting random snacks an excuse to take a morning walk... Reading an "unproblematic" novel might also help; the less you think about complicated relationships, the less you have to think about it. More humorous or at least comfortable shows, novels, podcasts, anything might also be good as a distraction... Recently I've been just putting on a game livestream by someone who doesn't yell and whose chat is civil. Then I don't even watch it, I just lie down and close my eyes LOL
Compassion for yourself is a good term but sometimes hard to visualize. Sometimes, what you need is reaching out to others, but unless they're capable of meeting you halfway and understand what you need, it's even more of a downer... If such a friend is unavailable for you, then it's really second best to just lie down and do nothing (to a certain degree!). Taking care of yourself is, in short, a long-term strategy. If you want to put it in a bad way, if you burn out permanently here, then that's the entirety of your "career" of compassion towards others.
Thank you, though. Compassion fatigue is excruciating, but the fact that you've tried your best to help people, I thank you. That being said, you are also a person, and thus worthy of equal amount of help. If you were to treat yourself as someone else, what would you say to them?