My son with autism is a happy young adult with a big engaging personality. But his left hand is permanently swollen and scarred. He bites his hand when he gets anxious,occasionally so hard that it bleeds. Sometimes we know what triggers the panic attacks. Often we have no idea. They simply arise within, from his biology. In very anxious episodes he may pound his head and cry, “my head hurts.” His gift of autism comes with a heavy price.