anxiety
"I have been taking Xanax off and on for about 3 years now. It is great for anxiety. I spent thousands of dollars going to the ER thinking I was having a heart attack before it was brought to my attention that it was actually anxiety. I take 0.5mg as needed now. I noticed that when I stopped taking it that I could not sleep for days and I became shaky at times, and the anxiety returns immediately. The other thing that I notice is that after a while you become immune to the dosage. If you only take it with the onset of an anxiety or panic attack it shouldn't be a problem."