Sora, anxiety is a possible side effect of birth control, although it's usually not so severe that it causes panic attacks.... I've never seen any research done on the topic either, but it's a symptom listed on the insert which comes with the pills. You may want to check that out.
my pill (ortho try cyclen lo) seems to give me problems with anxiety as well, sometimes to the point where my stomach is so jittery that I can't eat or sleep for a long period of time. I'm on my 4th pack of pills (i began taking bc in january) and i'm still having problems with side effects.
Anyway, you may want to contact your doctor and ask for a pill with a lower hormone level. The clinician I speak with at planned parenthood is going to put me on a lower dose if my symptoms don't go away in 2 more months.
Nicole