I never had sinus problems until taking Xanax. The Ashton Manual does state that sinus problems is a w/d symptom.
Sinus issues was one of my worst symptoms. I had 2 infections and was treated with Amoxycillin without a problem. Astepro, a script nasal spray, helped alot and is not an antihistamine. I coughed 24/7 from the nasal drip and went through dozens of boxes of tissues for months. I am off xanax now 18 months and still have this issue during a wave. I also had alot of wheezing in the bronchials. This symptom prevented me from lying down so I had to sleep in a recliner or bent over a table stacked with pillows to get some sleep. Some members have talked about stuffy noses, too. It was a very, very nasty symptom for me.
Two doses of Levaquin affected my cns system, hence, the use of Xanax. I hope this symptom ends soon.