How many expiations must be given to clear oneself, knowing that I suffer from obsessive-compulsive disorder?

We advise ignoring obsessions and turning away from them, and not paying them any mind, for that is the best cure for them. You are not obliged to atone for expiations you doubt are incumbent upon you, for the fundamental principle is that you are free from liability, and you are only bound by certainty. It is not legislated to indulge in obsessions by performing expiations whose obligation you doubt.