Hi Crayz... Welcome to Anxiety Zone!
Stress hormones, such as cortisol, can actually destroy brain cells in the hippocampus region of the brain. This can cause anxiety/panic attacks/depression, and the symptoms that go along with these disorders. A cycle occurs, and anxiety/panic attacks/depression become the default setting of the brain.
The term "anti-anxiety", regarding medication, refers merely to tranquilizers, such as the benzodiazepines (Valium. Ativan, Klonopin). These medications only mask symptoms, and do nothing to repair the brain.
Anti-depressants, such as Zoloft, Prozac, and Celexa, actually stimulate the growth of new brain cells in the hippocampus region, thus repairing the damage. That is why anti-depressants take so long to work. Therapies known to work on repairing the brain include the anti-depressants, therapy (such as cognitive behavioral therapy-CBT), exercise, and the use of omega 3/fish oil.
I hope this helps to answer your questions.
The very best to you, Crayz!... Chuck