How can I get rid of the queasiness I feel after reading about a horrific event?

Recently, I had to read about a bunch of horrific criminal events for class. The events were described in horrific detail, down to how the crime was perpetuated and the extent of the injuries to the victim(s).

I don’t want to forget the info about the cases, only because I need to know them for the final. However, I am feeling queasy. How to get rid of the queasy feeling?