I think i need help but idk

I'm 19 I was raped two years ago now. I thought with time it is supposed to get better but its not. It actually getting worse the other night I had a nightmare that I don't remember but I was freaking out while sleeping. My friends and boyfriend did everything to wake me up but I apparently still kept thrashing about and punching things like the wall by my bed. I ended up punching my boyfriend in the back which woke me up and my best friend said she tried putting her hand on my arm and I elbowed her in the face. Finally the dumped water on my head n I woke up. I don't remember doing anything or what the dream was about. I have done self harm and other things. I just don't know what to do. I'm trying to find some little lie to cover up at work why my hands and arms are bruised (that's how hard I was punching and hitting things apparently). I did post this in another group but got no response