Not a lot of therapists are really very familiar with OCD, and unfortunately, some therapists inadvertently do more to make a patient feel like he or she is crazy than to help them.
At a recent conference, a therapist was talking to a panel of experts about a patient she was treating. She was telling the experts about all of the terrible thoughts that the patient had when the experts stopped her and said that the thoughts were not terrible, they were just thoughts.
She then started to argue with them, trying to convince them that the thoughts were terrible. Unfortunately, she had also conveyed to her patient that the thoughts were terrible, confirming for the patient that the poor guy was bad for having those thoughts.
But the thoughts were just thoughts, they were not good or bad. And people who have these thoughts are not crazy, they have OCD. If your therapist does not understand this, find another therapist.
Search for an expert in OCD because an expert will understand how difficult these thoughts are for you, and how bad and guilty you already feel, and will be able to help you learn how to handle the thoughts.