I agree with Paxiled. Call the doctor's office and clarify your dose ASAP, in case it was a mistake. Also, you need to know how your doctor is recommending you take the Xanax. How often are you taking the Xanax?
Maybe the doctor upped your dose because you are so anxious, he noted it, and increased your med dose. He should have discussed it with you. If it bothers you that much, cut them in half until you see him next time. Good luck and God bless.
Contact his office and first see if he did it on purpose, if you haven't already. Could have been a mistake.