your beta blocker is useful for the physical anxiety problems, maybe ask doc about upping the dose for the bad days
rather than an AD I would be trying to get some benzo to take only as needed, goes well with your other med
before seeing a therapist, why not borrow books and tapes from your library on overcoming agoraphobia and panic disorder as these have all the info you need and are much cheaper
you can say you are trying to help a friend