Well if the AD's don't help even at higher doses I'd start by asking for a longer acting benzo like klonopin or even ativan. Xanax is fine but if your anxiety is more or less not under "decent" control with xanax, a longer acting med might be better assuming the xanax does work.....just not quite long enough. Xanax is "in and out" perhaps too fast for you.
Are you seeing a psychiatrist or GP? If the SSRI/SNRI family isn't cutting it ask about a TCA like trazodone/remeron. Don't be afraid to let him know this is getting to be too much or even just switch docs. I would if you're not getting anywhere. This can be brought under better control for most patients for sure. It does take time for some unfortunately.
The beta blocker(metoprolol) you take should help with all the adrenaline symptoms so ask your BP doc if upping the dose would be safe. You don't want to lower BP too much though.
Also have you talked to a counselor to see of there not anything causing/increasing your anxiety on the purely psychological side? The PDOC(if seeing one) should be checking this anyway. PM me any time. Alankay.