The flu-like symptoms as feelings of heaviness or a "spacey" feeling in your sinuses. Sometimes a feeling of heaviness or tiredness, similar to having a cold or flu-like feelings in your sinuses and flu-like symptoms of weakness in the body and limbs. Stress can bring on symptoms as mentioned above.
I have been drug free for about a year, but these occur during the day and usually go away in the evening at any time and can last for a couple hours to 4-6 hours in my experience.
When I quit the original xanax I was switched over to valium and took the last tiny portion about a year ago.