to blue island, I think your xanax dose is too high, also a dose only lasts about 2 hours, xanax is best taken only as needed, carry a few tablets with you and disolve 1 under the tongue when panic or anxiety starts
a small dose of xanax can be taken as insurance before the job interviews
agree that a longer acting benzo may suit you better, a psych who wont prescribe any benzos has probably been brainwashed into 'antidepressants only for anxiety' and isnt worth seeing, IMO
beta blockers are the best PB meds for you as they are the only ones that calm your body
hope you are also learning relaxation, books on overcoming agoraphobia and panic attacks have much useful info