Had terrible anxiety and panic attacks for years before I finally "admitted defeat" and got on Prozac. It takes the edge off without changing your personality. Doc also gave me
Oxazepam which is a weaker version of Klonopin. Oxazepam is good stuff because I could take it at work and not be a zombie. I would definitely recommend Oxazepam instead of Klonazepam (Klonopin).
I felt like I was being punished, or that I was standing outside myself and watching myself go insane. I would burst into tears or fly into a rage for no reason, couldn't sleep and had nightmares when I did, had obsessive horrible thoughts. I would imagine what it would feel like to cut my tongue off with a pair of scissors. Then once that thought came I couldn't get rid of it. It was as if I lost control of my thought process.
My anxiety/panic attacks was a drug-induced condition. I partook a little too much in the chemical dept. (meth) and I basically short circuited my brain. Been drug free for going on 12 years now. I have a few drinks now and then though.
EDIT: Exercise does help quite a bit. Push-ups are good. Push-ups with somebody underneath you are even better.