I haven't been feeling like myself lately, been having too many nightmares?

I've been having nightmares every single night about someone trying to kill me, I've also been speaking to this guy who keeps rejecting me. And my family is at stress peak at the moment, and I'm in the midst of my crucial studies. I feel like I've lost myself and who I am. I don't know how to feel, or how I've been feeling. nervous, embarrassed (bout the guy situation), unhappy, and everything. I've lost myself.