i was on a large dose of xanax a few years back. after a sudden realization that i was addicted, i decided to completely cut it out of my life all of a sudden. it was a really horrible experience, i coulnd't sleep at all for days. i went to the doctor in a desperate state, he didn't even believe how much i'd been on and gave me a low dose prescription for more xanax! i munched the entire prescription all at once just to get a nights sleep. not a good doctor.
anyway took me quite a while to rebalance my mind and body, over a month of suffering. going cold turkey caused much more damage than reducing dose i think.