The most common method of treatment for OCD of all types is ERP (exposure response prevention) therapy. It is a subtype of cognitive behavioral therapy (CBT). The point of therapy is to identify the triggering thoughts and problematic thought patterns and subsequently, the behaviors that follow wether they be repetitive thoughts or actions or whatnot. ERP is basically gradually exposing oneself to the discomfort of the triggering thoughts or fears without doing anything to combat it (keeping oneself from performing 'necessary' rituals, neutralizing thoughts, etc.) I know that it sounds terrifying but with ERP, you have to feel worse in order to get better. It gets easier over time and you start really small and then gradually work yourself up to exposing yourself to triggers that cause more significant amounts of anxiety. The goal is that with repeated exposure, the fear lessens as your body realizes that nothing bad is going to happen.

From personal experience, this type of therapy is extremely difficult to do without a therapist or a CBT specialist. Not because it's a complicated method but because it is hard to hold yourself accountable and actually follow through with the program. There are many books that will guide you through ERP. But when you are facing such extreme anxiety, it is really hard not to give into those feelings.

Best of luck to you!