Disorders-does a sense of calm help?

A child in class was just diagnosed with OCD, Obsessive Compulsive Disorder-- and luckily, not a bad case. The poor kid justcouldn't sleep if there is any transition in his life, so was sleepy in class. I know many people whose children have been seeing therapists for anxiety-- we're a nation of anxiety. Much as I think parents need to pursue all the options for their child, I also feel that there is something to be said for making children feel secure-whether at home or at school. Sometimes, when I substitute teach I start the day by saying to the children "Relax, I am a nice teacher. I am not going to yell at you, but I want to make sure that you understand the lessons for today." I see the class give a collective sigh.
A child with OCD is not so very different from them, he just worries a little more. But they all worry. Of course bad behavior can't be tolerated, children can't be throwing things around the room and standing on the desks and cursing each other (which my sweet suburban classes never do), but even if a teacher is disciplining a class, a measure of calmness, a feeling of fairness,
--security. I think it makes all the difference. So many things are changing, let there be someplace safe.