Oh this topic is interesting, I could go on forever about my crazy theories of how ocd and addiction are actually kind of the same thing. I mean drinking for an alcoholic is an obsessive, compulsive behavior is it not?
The rituals people with ocd have help them "manage" their anxiety.. they may not be able to control other people, events, circumstances, etc. but they do have control over how many times the door is locked or whatever else it might be.
I don't seem to have active symptoms now but did actually had the same intrusive thoughts/obsession (for a few months or so) when I was a child about harm coming to my family members.. was actually convinced they were going to die. That's how I know ocd is and always has been a factor in my addiction(s).
CBT seems like a great treatment method.. you can't always control your thoughts or your emotions, but you can control your actions. That's the empowering part.