Why do I keep having bad dreams, how do I make them stop?

I don't really remember any of them but they are always bad. Sometimes their more nightmare-ish but usually their just really, really bad events happening (Like a series of unfortunate events) and I can feel my anxiety level rising more and more as the dream goes on and I wake up breathing heavy and heart pounding... The only part of the dream I just had that I can remember is my dad had some bloody gash somewhere on his body, and my mom was trying to help him, and I thought he was dying. It scared the **** out of me. What do I do about this..?