I Have Taken Half Of The Lowest Dose Of Xanax

I have taken half of the lowest dose of Xanax occasionally in the evenings during anxious times-i.e. holidays, other stressful situations, to help "shut my mind off" so I can sleep. I called my Dr. for a refill and I have to go in for a consultation due to "new information" released about this medication. I say "if it ain't broke, don't fix it"! Can you enlighten me on this?