Is compulsively obsessing, Obsessive Compulsive Disorder?

I obsess about many different things. Some of them are important to most people, others are important only to me, and some of them I don't even feel are important, yet I am compelled to think about them. I understand that OCD is typically characterized by obsessing over an action and then feeling compelled to do that action in an attempt to relieve the stress caused by the obsession. I suppose my question is, can the obsession itself be the action that one is compelled to do? I don't have any of the typical symptoms, lock checking, hand washing, or other unnecessary or excessive rituals. But I have a compulsion to obsess. I fell like if I don't think about something, then... I don't know, something bad will happen. But I can be kept up at night, or away from the things that I should be doing, thinking about world problems that I couldn't possibly fix, or what it would take to convince me of the existence of leprechauns, or how I could have better handled that situation with a bully when I was in the 5th grade, or how I obsess too much instead of sleeping or doing the dishes. Is this OCD or some other anxiety disorder? I also suffer from depression and my obsessions are at times about suicide, usually in quite disturbing, albeit unrealistic, ways. I'll spare you the gory details in sake of your own mental health. :)