"Sucking it up" isn't actually an option. You're describing a mental health crisis. Unless other people might literally die (e.g., you're a soldier, police offi

"Sucking it up" isn't actually an option. You're describing a mental health crisis. Unless other people might literally die (e.g., you're a soldier, police officer, etc) then your job is not worth sacrificing your own life. Consider another perspective: if you get to the breaking point, which you're near, you're going to leave—either because you quit or because you wind up in a hospital. You think you're important—but you are not helping the company if your only options are to quit or die of overwork. Both of those situations end up with 0% of your energy going to the business. Many people mentioned therapy, which I think is a good idea for everybody. My recommendation is to draw a boundary. Say "here's how much energy I feel comfortable putting in." Then really reflect on how to use that energy in the way that will help the company the most. That might mean hiring or training people. It might mean continuing to do what you do now, but letting more things fall to others—or just letting some things not happen. You are more valuable to your company if you are healthy and present than if you are unhealthy and quit. When you start to feel "my only option is to quit because I'm too important" you're just indulging in a fantasy of running away.