Hi there!!

You have quite a few really good coping mechanisms--I'm going to have to try the celery one!
I also try to stay away from caffeine (even though I am a Diet Coke freak and adore Starbucks) because it seems to make my panic attacks worse. However, I'm a zombie in the morning without it so I limit it and don't drink too much in the afternoon. Also, instead of Actifed I chew a children's Benadryl--my doctor told me once that it helps with panic and n* and for some reason only the kid's version works for me.
Pilates is awesome!! I've been doing it for quite awhile now, and not only does it work quickly but it is very relaxing.
If I'm especially nervous in the car I've made some "relaxation" CD's with instrumental New-Age type music on it. It's worked quite well--once when I panicked at the mall I got in my car and it actually helped calm me down. Plus it helps with my the road rage I tend to get driving in city traffic!