PTSD triggers as described (accurately) in a juvenile fiction book

Pain and sadness are homeless beggars in my life, displaced feelings that come and go, plopping down for their own reasons, sleeping in any corner of my brain. They wear at me with a constant tiredness that I have to chase out.

"Sometimes, though, a trigger pulls inside me, and the pain goes off, getting bad. It isn't like I know all the triggers, but school newness is a definite."

- Clinton, Cathryn. The Eyes of Van Gogh.