I do take Clonazepam when I get severe panic attacks or right before something I know usually triggers a panic attack, but nothing on a day-to-day basis. Clonazepam does seem to help with my symptoms, though it just makes me feel euphoric (which, I guess, is better than feeling like I'm dying). I take a tiny dose, but it seems to help a lot.
I have a few things I wish I'd done sooner if you'd indulge my ranty and highly personal list:
* Moving out of the city and into the country. I know this one is not feasible for most people, but it helped me to get out of the hustle and bustle and back to an environment similar to where I grew up.
* Reducing caffeine and increasing water intake. I limit myself to one cup of coffee in the morning and no caffeine afterward.
* Quitting my high-stress job in favor of a job at a startup and taking more breaks.
* Daily cardio exercise for at least 30 minutes.
* Talking about how I'm feeling with my partner. It seems simple and silly, but this one is crucial for me. I tend to lock up when I'm feeling crappy and lash out. Overcoming that and talking about how I'm feeling has helped enormously.
* Going to therapy.
These are all helping me cope, so I still have panic attacks, but not as often as a decade or so ago.