You've got to chase them the heck down and eventually have faith that you can and will catch them!
Anything is possible- anything! Well, within in reason of course. Meaning, if you were born in another country, your chances of becoming the President of the US are probably as good as Donald Trump's. But in all seriousness, you can literally dream your reality up according to all the meta-physical experts. And if we can think, then we too qualify as meta-physical beings because we are the ones who can recognize and give power to our dreams.
Can our nightmares also come true? You bet your little toocan that they can! Whatever you give attention to is what you will discover appears right before your very eyes. Can you chase your nightmares away? Of course you can, but its going to take some discipline and re-thinking about how you think about stuff. In the end, its only stuff- and the more you make your stuff scarier, the more this ghostly stuff will chase you down and even come get you in your dreams.
The opposite is true! Stop listening to the news before you go to bed and or when you wake up first thing in the morning and you will see that you will start focusing on the positive good stuff that can help accelerate your dreams and make your nightmares a thing of the past. The good news about all of this is that you are the one in control of what you choose to focus on - choose the non scary positive stuff that will give you more good stuff to dream about!