An untreated sufferer has very little control over his or her OCD, however, it is not a question of control as much as it is a question of fear.
Once people with OCD learn how to handle their fear, they can often see improvements in their OCD. If people with OCD had no control over their disorder, then even therapy would not be helpful.
As for attention, therapists have found that people with OCD often do not want attention drawn to them; they prefer to do their rituals in private or with little fanfare.
If people really wanted to get attention, there are better ways to get it than to have OCD.