Conversion disorder is when someone (usually an adolescent, and female) takes some sort of outside stimulus (school bullying, or puberty, or nerves, or whatever) and manifests it as physical symptoms.
ALL nursing students suffer from a bit of this, when we worry ourselves sick, or we give ourselves headaches, convinced we're failing a course. This is not a disorder.
A patient today DID have the disorder. Breaking the odds, he was male, 13 years old, good student, all that. And he was dizzy. REALLY dizzy, especially when he stood up, or was made to do anything he didn't want. Suprisingly, even sitting up or standing or walking, he had NO problems, as long as he was goofing off, or talking on his cell, or looking for snacks. Assess him, or let anyone in a white coat enter the room, and suddenly he was "super dizzy, weak, and unable to stand on his own".
I feel bad for the kid. If he had an organic problem, there'd be an easier fix...with this, he's got to use meditation and biofeedback, and possibly wait to grow out of it.
Modern medicine mostly sucks at behavioral conditioning...except when it involves training people to take medications...