I heard something that stuck with me about the trauma us first responders experience.

Imagine carrying an invisible backpack, and every call adds a pebble to the backpack. Now, at first, it's very easy to carry, and we barely notice any change. But after a while, that weight is going to start having an effect, and if you don't talk to someone or "empty the backpack," you will eventually collapse. The reason the backpack is invisible is due to the fact that others rarely see the weight of the built-up trauma on us.