How do I handle the fear of emergencies and split-second calls in the air?

You follow the safety procedures well when things are normal. What frightens you is the other kind of moment, the emergency, the split-second call where there is no time to look anything up. That fear is not a weakness. It is a healthy respect for how fast things can go wrong, and it is the very thing that will make you drill until you are ready. Here is the reassurance underneath the fear. In a real emergency you will not be inventing a response, you will be running one you have trained until it is nearly automatic. That is the whole reason for the endless procedures and drills, so that when your thinking brain floods, your trained habits keep flying the aircraft. The people who handle emergencies calmly are not fearless. They have just practiced the response so many times it runs without waiting for calm. So train the emergencies until they are boring, not just until you pass. Rehearse the memory items, the first critical actions, until you could do them half-asleep. Chair-fly the scenarios that scare you most and walk through exactly what your hands would do. The fear will not vanish, and it should not. But it will sit under a layer of trained response deep enough that when the moment comes, you act first and feel it after.