Showing The Night I Disappeared by Julie Reece Deaver

Something scary is happening to seventeen-year-old Jamie Tessman. Ever since she and her mother arrived in Chicago, she’s been plagued by freaky mind-slips and vivid daydreams about her sort-of boyfriend, Webb. When Jamie’s inner world starts taking her hostage and keeping her imprisoned for longer periods of time, she becomes terrified that she is slowly losing her mind.

Jamie’s mom doesn’t seem to notice anything is wrong. No one does—until Jamie meets Morgan, a new friend who’s had her own “brush with nuttiness.” When Jamie disappears into her inner world one night and can’t find her way out, Morgan sees to it that Jamie finally gets help. Morgan’s aunt, a psychiatrist, breaks through Jamie’s paralyzing fear and helps her unravel a tangle of long-forgotten, horrifying secrets in her past...