Yes...2mg a day seems a bit high.
"amnesia or forgetfulness, trouble concentrating" are side effects for xanax.
http://health.yahoo.com/anxiety-medications/alprazolam/healthwise--d00168a1.html#d00168a1-sideeffects
If you haven't had side effects after 6 months, then I wouldn't be overly concerned about it now!
hmm i would not recremond taking that high of a dose daily, i take half a dose daily at the most 1 mg on a bad day