OCD can simply be cured by a mental excercise in just one day. Your mind is tricking you in making you believe that something bad will happen to you if you don't do the OCD ritual. You need to start believing that something bad will happen if you do any ritual at all. It works and OCD will be cured forever, because now you have a new form of OCD, the one that don't allow you to do shitty things.