Hydroxyzine
"I was prescribed this medication when I suffered a severe anxiety attack. I had mild attacks before, but I honestly thought I would die that day. 
I took one pill and it knocked me out for 12 hours! I was sitting in class a week later and I felt another anxiety attack coming on so, remembering what happened with the last pill, I bit the pill in half and took the smaller piece. It knocked me out for 8 hours!!! Good thing I didn't have to work that day! I have never taken anything for my anxiety previously but I wanted to get my attacks under control. I discovered meditation works best! If you have never tried it...find a local class and sit through it!! I promise it will help you find the peace you are seeking!!"