My grandmother was murdered,possibly by my geandfather, should I quit my high stress job if I can afford to?

My grandmother was murdered. On a Friday I was supposed to see her and my grandfather to make sure she got to a appointment on time. I got there I found my grandfather half dead on the kitchen floor. I umed he had fallen and received a hea injury. I called EMS, then searched for my grandmother. I could not find her, the neighbors had not seen her. EMS arrived,looked at my grandfather and determined that he had been aulted and left for dead that it was not an injury from falling. The police were notified and arrived. My grandmother was found naked in the upstairs bathtub shot in the head three times. The police are currently investigating if it had been a murder suicide. First let me say I do not believe that my grandfather killed her. He is currently in a state prison waiting trial. He was in a coma for three months due tithe severity of his head wound. Several doctors have said that his injuries could not be self inflicted, that he appeared to have been beaten. My grandfather would never harm anyone let alone my grandmother.There are a whole lot of other sordid details missing money and property ect. My grandparents meant the world to me, I saw them once a month if not more often. I spent whole summers with them and my grandfather was my hero. This whole situation is almost more then I can bear. The reason for writting this is that I work in a very high stress job. I am a supervisor at residential program for troubled teens and lately I feel as if I am going to snap. One of the kids today made a rude comment to me an I had to take five to cry in the bathroom. I am not a wimpy person and I have had kids here say far worse to me, it never bothered me, it is the nature of my job. But now it does. Should I quit this job? I feel like I can't handle it right now. I am getting to the point that I am afraid to go in, wondering if I will be able to make it through the day without crying, wondering if I will snap and start crying or screaming at them.