The DSM-V is a manual designed to help mental health professionals diagnose and treat mental disorders. It is not organized alphabetically, but rather orders the contents under broad categories. You can find the disorder your researching by using the index at the back. For some disorders, you may need to look up synonyms or use google to find out how the disorder is titled.
Each entry contains information about the diagnosis, prevalance, development and course, prognosis, comorbidity, etc.