Posted 3/27/2017 2:44 AM (GMT 0)
Xanax has a half-life of 9-16hrs. Therefore, if you take it regularly you should not notice significant withdrawal effects until after about 4 days. Kickback anxiety is normal after regular use of any benzodiazepine. Your body may have gotten used to your current dose and the drug is therefore losing it's effectiveness.
Good luck!