Hi,
I have a friend who has OCD and he ruminates a lot. I think like other conditions not everybody with OCD will have the same symptoms-sort of like a spectrum of symptoms that could occur. He finally sought therapy after I had been telling him for months. Then he got diagnosed with OCD. We didn't know he had that beforehand, just that he really had a hard time worrying/ ruminating all the time. He has a good therapist now. She treats him using CBT (cognitive behavioural therapy) and he's been doing this for two years now and says that he's really happy he has tools now to deal with stuff. He also sees his therapist once a week (online).