when it comes to this topic, i am a christian (episcopalian to be exact), however, no matter what religion you are each has a belief system that can help in any troubling time.
In my religion it is my faith and piety that gets me through the hard calls. Especially as a corpsmen in the Navy (oversee's "calls"). If you use your piety to become close to God (*or whatever you worship) when you are off duty, it will allow you to have faith that God* is watching over you and your patients.
Not sure if it helps but this is a little prayer i say before i would go out on calls or patrols(military). It's a mix of some of my favorite prayers/psalms, it may be a little corny, but it gets me through the day just fine.
Lord, grant me the strength to do the work you have given me to do, allow me to work miracles through your name, watch over my crew, my patients, and myself as i set forth to walk through the shadow of the valley of death and I shall fear no evil for i KNOW thou art with me. Amen.
if all else fails...........pray