The horror of discovering that my boy had OCD made me frantic to understand it. Know thine enemy.
As time has passed I have had to come to terms with the knowledge that I never really will. It is a changing beast that is not only individual to the person, but it morphs and evolves.
We have to try to understand up to a point. Then we reach the edge of the cliff looking out into a darkness through which we cannot pass, and we know our child is out there alone.