They really are quite the nifty pill for those who deal specifically with panic-associated anxiety. What you are experiencing is the wear-off effect (somewhat like alcohol, though not directly correlated). What happens is that you will gradually return to your 'normal' state as you were before taking the pill, which you will be more 'aware' of then you were before. Its like eating vanilla all your life, and then you taste chocolate, then you go back to vanilla, and it just isnt the same. That is what happens after your benzo wears off. The benzo is making you feel great, calm, collected, confident, etc...then that all wears away. What is best is to stay away from benzos such as xanax, which has a quick and very high 'high' and then drops off quick, so you will crash back into your normal state and feel it very much so. Some drugs such as Klonopin is a slower release, gradual high and very slow decline, so that by the time your body is rid of it (6-12 hours completely about) you have the potential to feel nothing different, both because it wears off so slow, and because it has possibly triggered some placebo affects that you carry on after it stops working (by believing its still working, or just simply carrying on your relaxed state of mind). Hope this helps!