Do I have depression?

Patient: I think I have depression. About once every 2 months I just sit and cry and isolate myself from everyone. I think of horrible things about myself, but when I am not in that mind set, these kind of things do not cross my mind, although I do worry about what other people think and say about me. I am not bullied in any way, shape or form. Do I have Depression?

Symptoms: Thinking horrible thoughts, eg.about me.