Free Radical,
Many days I panic about panicking (what a vicious cycle huh?!)and this will send me home on many occasions. I go to school full-time and when I go my biggest fear is panicking while in class and having to get up and leave. Some days I get through and some days I just have to leave. This is more of a problem for you since you have to leave work but what I do, which has helped, is positive self-talk. Like so what if I panic, I will survive and if it gets really really bad I can just leave. Also, distraction seems to work wonders for me. So if I start to fear that I will panic I try to focus on writing stuff out, text messaging a friend to get my mind off of things, nervous chatter, etc. Well, it is different for everyone but I hope this helps. Good luck!
~Isabella~