Around three quarters of a million people are thought to be living with severe, life impacting and debilitating Obsessive-Compulsive Disorder (OCD) here in the UK. OCD — it's more than you think! If you feel you might be affected by OCD you can find out about the problem and how OCD is diagnosed in this section. All you need to know about Obsessive-Compulsive Disorder. This section will.