anxiety at work

I seem to be fairly relaxed in my personal life but endure severe panic attacks when at work ( and occassionally in busy supermarkets too). I was diagnosed with an anxiety disorder 4 years ago and took some anti depressants and attended Cognitive behavioural therapy which has help manage, but not eleviate, my symptoms. It's particularly bad when there are lots of people around and I'm starting to think it's more of a social phobia. having low blood pressure doaesn't help! I can suddenly feel as if I'm falling, the room spins, my heart races and I just want to run. I do regular exercise, eat healthily, avoid caffeine and only drink a little alcohol at the weekend. What else can I try to free myself from this horrible disorder - it's much worse than childbirth!