You should study more, use the web, go over the study guide, and review your old tests. Unlike the mood disorders, the anxiety disorders can be traced back to organic causes. Psychologically problematic behaviors are different in degree, rather than kind. The line between abnormal and normal is clear-cut. I am extremely positive about my own self-worth, so much so that I can't really find anyone who loves me as much as I deserve to be loved.
Schizophrenia is the most common psychological disorder.
A person with mulitple personalities is schizophrenic. Individuals with bipolar disorder shift from being obsessive to compulsive. Phobia is an anxiety disorder. Loss of positive affect is typical of conversion disorders. I am called a nondirective therapist.