Never been on Xanax, so I can't give you any advice about that.
Just, hold on for two more days. You can make it. Chill out with the pets and hibernate if you have to. Wait, you have to work, don't you? Darn.
Could it be a psychological instead of physical addiction, especially if the Tylenol PM is a good sub? If you can get to the store, try some kava kava tea. I have Yogi brand. That might help a little in the interim.
(((((((Pat)))))))