mental ailmentlong-name feelings of blankness and loneliness. You might have extreme mental state changes over a short space of instance. It's ordinary for people with borderline personality disorder to feel suicidal with despair, and then experience reasonably positive a few hours later. Some people feel better in the morning and some in the evening. The pattern varies, but the key sign is that your emotions swing in unpredictable ways. Disturbed patterns of thoughts in borderline personality disorder: There are three grades of troubled thinking that can affect individual with borderline personality disorder.