I am sorry you are having problems weaning off of a benzo. I weaned down from Valium 40 mg/day to 2 mg/day when needed. I weaned very slowly dropping by 2 mg per week. It took me 20 weeks but I had no withdrawal sx.
I worked very closely with my Pdoc.
I would keep working on weaning and hopefully any symptoms will go away.
As long as you have come this far, I would take your last pill and then let go of it.........just stay in the moment and don't fear that you are going to have an panic attack.
You will be ok. Many people give up meds for different reasons and deal with it just fine.
Vistaril is a great drug and often overlooked by physicians when prescribing for Anxiety. It also can help you if you have insomnia.
I think your on the right track and do count on us to support you.