Flying in a helicopter is not all glory. There are many helicopter crashes in the US every year, and typically everyone on board is killed. I thrive on the challenge. I've been in the business for 22 years and every day is different. You have to think on your feet and be able to multi-task.
Every situation is stressful to a point.
As flight paramedics we learn to handle that stress. We don't run in shouting at the top of our lungs. What may be most stressful is when you're doing the best you can, but it's not good enough. For example, somebody may be trapped under a car and you're doing everything you can to extricate them. But you're fighting the clock and you know they won't survive.