My job just trensferred me to suddenly being responsible for managing the blood sugar levels of a diabetic 5-year-old. Not without instruction, and I have been doing fine so far, but this is absolutely terrifying because it is so important. I think I can do this, but it is so scary. I'm experiencing whatever the opposite of alienation from your work is right now. It's actually an amazing feeling. Still terrified though.
Luckily this is in the central part of a major city, so worst case - which is what I need to be prepared for - an ambulance is never far away. I would feel like shit if I failed like that, but it is a comfort to know.