I quit taking xanax after taking it for about 5 years strait, not prescribed to me or anything. This was about 2005
I decided to quit when I realised I no longer wanted to hang out with friends, work, or go to class, I would just stay in my apartment laying on the couch and I would eat dinner with people every night, but that was about it.
After quitting xanax I had horrible anxiety, to the point where I did not leave my apartment for 6 months strait, I had lived on about $10000 I had for college. The reasons I quit taking the drug caused me the exact same problems when I was on it.
I eventually went to a drug abuse program, but it did not help with my social anxiety at all. In public I never felt safe, when I was around people I would hear things they weren't saying, so I went back to not leaving my apartment for another year.
Eventually my anxiety began to go away when I met a girl I had know from college at a coffee shop, she was working there, and had not graduated her self. We began dating and I realized I had to actually leave my place so I did not seem like a huge loser.
I broke up with her a few months ago and now I'm finishing my last year of school at 23, after spending 2 years lock up in my room.