So here we go:
Suggestion One: Always take a break when you are overwhelmed. Whether it is going to get a drink, going outside, listening to music, or calling a friend, taking a break is one of the most helpful things I do when getting overwhelmed with the violence.
Suggestion Two: Pick up something that really is one of your favorite smells. A vanilla candle, a nice cinnamon, or even your favorite fragrance or perfume. Whatever it is, the smell will bring you back to some of those wonderful thoughts and moments of joy.
Suggestion Three: Take a shower, hot bath, put an ice pack on yourself but change the temperature of how your body may be feeling. Often times, even a hot cup of your favorite liquid (Rojos' Coffee - YES!) can shift your mind out of the horrible things that you read or see.
At the end of the day, minimizing the trauma of working with some of these types of data can be managed and the effects they have on you minimized. Remember to take good care of yourself at all times and in so doing, you can continue the work the next day, and the next.
May we all have a very special journey and joy in as many steps as possible!