Anxiety can be caused by many things, but it usually results in physical changes to the amygdala, which makes you much more sensitive to stress. There are behavioral therapies that can help. they do take some effort and discomfort, but have a good track record. Medication can assist in controlling the anxious reactions, or make you less sensitive to stress stimuli, which can help you focus on the therapy. Medicine will not fix it, only assist in control.