Two-three mg Xanax a day for 6 days? I'd be very surprised if you had WDs using that small amount for 6 days. Even a couple weeks of that dose seems like it would be safe. If, for some odd reason you start experiencing rebound anxiety (which likely would be psychological cravings that cause anxiety), liquor is a GABA-ergic drug, a pretty good anxiolytic, decent painkiller, and should take care of the couple of days you may experience anything close to WDs if you don't want to take more benzos (that would likely be your cravings or worrying about WDs causing anxiety). Unless you're prone to seizures (the most dangerous part of benzo WDs), I wouldn't be worried about it. Even then, such a small amount of benzos (a short acting benzo at that) for such a short time, probably would carry little danger of BZD seizures.