What do I do?

I have a reoccurring dreams where my brother-in-law's friend rapes me.  They usually go something like this:

It usually starts out that I am out doing stuff alone.  He will somehow manage to push his way in and rape me.  I wake up freaked out and in sweat.  
I have never been raped in real life and now I have no idea who to turn to for help.  I still have to be nice to this guy, but I don't know how to talk to him.  I can't go to my brother-in-law, because he will probably just get mad at me.  I can't go to my husband, he will not understand.  
I just want to get to the bottom of this, and this dream needs to stop.  What could this dream mean?  Any help would be wonderful.