I'd had a few bouts with anxiety (nothing close to a panic attack) in the past and took celexa for about 9 months. It seemed to help and the doctor thought I was ready to back off of the meds. 6 months after being off the drug, I had a major panic attack that left me unable to stand up for 15 minutes. I had a complete checkup, and the only finding was that my blood sugar had gone into orbit - pre-diabetic, in fact (118.) The doctor suggested paxil, but I decided to try to fix the sugar problem first to see if that would help. I was about 30 lbs overweight. I followed the general diet suggested in "Stop Pre-Diabetes Now" and lost almost a pound a day for about a month. Now I'm just a few pounds overweight, and consciously moderated the diet to keep from losing weight so fast. My blood shows completely healthy sugar levels (97) and cholesteral levels lower than they have been in years. My daily mood is much, much better. However, even my minor anxious moments did tend to come only 2 or 3 times a year - so whether I'm completely over them is still probably in question.
My doctor did give me adivan to take if I felt an attack coming on. I'd prefer this "tactical" solution rather than putting my liver through a daily drug. I haven't had to take any yet, and it's been a few months since my attack.
My suggestion is to at least investigate dietary solutions if your situation is not too cronic to tolerate the time it takes to experiment.