Into the End, by Bonnie Paulson

After a number of natural disasters hit the USA, an unknown force invades in this confusing, first in a series, novel.  Our hero, Rachel, is a psychologist who worked for the US government on how to frighten people, and some of the scenarios that occur in the invasion map to her work.  So what's going on?  Apparently only those who read the next book in the series will find out.  I, therefore, will never know.

Into the End (Into the End Series)