So you've seen the doctor and they tell you what they think you have or sometimes they don't tell you and give you a broader term.

How do you believe them, when you can't see it yourself?

Someone with the classic kind of OCD - they can tell they have that - they can believe it when someone tells them, well I could anyway.

For other things though - how can you tell when everything you see is pushing you in a different direction to what they are saying to you.

Is it just you can never tell?