Work place favoritism / sexual assault / depression

So I work overnights and I noticed my supervisor started to show favoritism towards certain employees (they can do certain things, I get told to do other things last minute before I leave, they can sit around and do no work, she sends me to do a million things etc) I was recently sexually assaulted and the fact I work in health care I chose not to tell anyone in my department due to how much people run and tell. I already deal with severe depression and anxiety and it’s only gotten worse since the assault. I don’t know how to approach anything especially the favoritism but it bothers me to the point I just don’t speak to anyone anymore . Any advice?