I have been on no less than 40 different anti-anxiety/anti-depressants for my panic attacks in the last 5 years alone, and have been having panic attacks for the past 10 years. I didn't find any medication that did even a little bit of good other than valium, but doctors don't like prescribing that particular medication, and I haven't found one that will prescribe it again since I've moved.
And you will find, that for some reason, the majority of doctors out there that are just general practitioners and not psychiatrist/psychologists will way under prescribe most anti-anxiety/anti-depressants. The reason for this is because the majority of the meds are considered "addictive", and even if you've proven that you don't become immune to the meds and need to have it increased constantly over a full year they still won't want to give you the correct dosage and will likely want to pull you off the drug and put you on something entirely different.
I finally gave up medication altogether because in the end it was only making things worse, and at this point I'm close to being at my lowest point because I spent so many years on the medication, save for the fact that I can pull myself out of bed to get to work every day, but sadly that's about the only thing I can manage to get out of bed for. I was in therapy for about 6 months until it got to be too expensive, but it had the best results thus far.
I know overall medication is cheaper for the most part, but I would really recommend finding a good therapist that deals with anxiety. There is almost always a root cause that ISN'T a chemical imbalance. And finding that cause and dealing with it is really the only way to truly fix this problem and not just cover it up with medication. It's just easier for regular doctors to point at something that can be fixed with pills.