Some research suggests that people who have panic disorder might be very sensitive to sensory experiences (such as sunlight, smells and changes in the weather), but there's not enough evidence yet to say for sure. Also it's not clear whether having a high level of sensitivity to these sorts of things is something that might cause you to develop panic disorder, or whether it may be an effect of having it.
A form of psychotherapy called cognitive behavioural therapy (CBT) has been found by several studies to be the most effective treatment for panic attacks and panic disorder. During CBT, you will work with a therapist on relaxation training, restructuring your thoughts and behaviors, mindfulness, exposure treatment, and stress reduction. Many people that suffer from panic attacks start to notice a reduction within weeks, and symptoms often decrease significantly or go away completely within several months.
Selective mutism: A somewhat rare disorder associated with anxiety is selective mutism. Selective mutism occurs when people fail to speak in specific social situations despite having normal language skills. Selective mutism usually occurs before the age of 5 and is often associated with extreme shyness, fear of social embarrassment, compulsive traits, withdrawal, clinging behavior, and temper tantrums. People diagnosed with selective mutism are often also diagnosed with other anxiety disorders.