Well, it sounds like your dreams about the end of the world is because there is so much talk about that now, more than ever. And, with the unsettled world issues along with the strange weather we have been having, it only adds to the wonder if the fear is founded.

But consider this, if the end does come, certainly there will be little we can do about it so there is no use stressing over it. While your awake you should think about that.
Then the fear in your dreams may go away.

Dreams can also be your brain's way of problem solving in your sleep. That is what I believe I experience. My brain is trying to resolve the tramatic things it has been forced to experience. I have been trying so hard to fight against it, even woken up yelling at myself to knock it off. Isn't it amazing that our brain can have so much free reign while we are asleep. I used to have wonderful vivid dreams until I experienced this last event. I dream in vivid full color as well. Some people say they don't dream. I used to like my dreams. Wish the good ones would come back, Im trying.