Many years ago before I was first diagnosed with depression I read many books on mental illness and got very confused myself. Every symptom of every disease sounds like your own. Medical students get into the same problem only they think they have a physical illness from reading symptoms from a book. You need to accept the diagnosis of your doctor and learn about that mental illness alone. If you do want to check anything else out, check out bipolar. Sometimes depression can be easily confused with bipolar.
Good Luck