That is great you got off the xanax. You may find, like many others, that once you are past the w/d you will be calmer without the xanax in your system.
Seems the constant interdose w/d and body adjusting to this chemical just make the body have a lot more chemcially induced anxiety.
You should get some sort of program where you do relaxation methods and learn how to apply these to the actual feeling of panic (this can be done).
Any therapist or most books for anxiety help with this technique.