Clonazepam
"Yes stopped anxiety in its tracks BUT and a big but it is very addictive and getting off of it has been very difficult EVEN when using a titration method of slowly decreasing dose.  I went as high as taking 3mg over a 3-year period.  The withdrawal from this drug for me was incredible it's been a month that I have been off of it and the anxiety and "brain fog" are intense, I'm hoping this goes away over time as it's very difficult to concentrate.  Do your homework BEFORE taking this medicine.  Be well."