welcome
lexapro is an antidepressant and these often are a big help for anxiety and panic attacks, but they usually do make you feel worse at first, I would have started on 5 or less then worked up to 10 or more gradually
xanax as needed will always help so carry a few tablets with you when out, fastest help if disolved under the tongue, also it helps to relax, dont tense up or fight back and do breathe deep and slow
there are many self help books on overcoming panic disorder and agoraphobia, get some and follow their advice
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