After combing through movie lists from IMDB to Reddit, I think I've created the most complete collection of horror movies that climb inside your skull and mess with your brains.
'Beginner's Guide: Psychological Horror'
'What Exactly Is a "Psychological" Horror Film?'
'Why We Crave Horror Movies' by Stephen King
'Common Themes in Psychological Thrillers'
'Death, Grief & Why Horror Films Matter'
'Psychological Horror in the Films of David Lynch'