How do I handle everyone's crises when I have no one to carry mine?

You answered a real calling, and already you feel it: everyone brings you their worst days, and when yours come, there is no one holding the space for you. That imbalance is one of the hardest parts of the work, and you are feeling it early. It does not mean you chose wrong. It means you have found the part of the calling no one describes at the start. A helper who never gets helped runs dry, and a dry well cannot give anyone water. So caring for yourself is not a betrayal of the calling. It is what makes the calling last. You need your own sources of support: people who see you as a human being and not only as the one with answers. Those relationships are not a luxury on the side. They are the foundation that keeps you standing. Do not wait for a breakdown to go looking for them. Build your support now, on purpose, while things are steady. One step: find one person, a mentor, a peer in the same role, a counselor, with whom you can simply be the one who struggles, and reach out to them this week. Even those who guide others need someone to guide them.