Experiencing stress through someone else is very much a real thing. Many people feel for the victims of the trauma and sometimes live it through them. The best way to get over this is to help the actual victim to recover, and then you should naturally recover on your own.
Yes, it happened to me when I found out my mom was abused by her boyfriend. I was completely convinced that it was my fault and had a difficult time forgiving myself. It still affects me to this day, but I have finally convinced myself that it was not my fault.