I can't figure out what's wrong. My birth control may be causing depression or making it worse?

I started having panic attacks back in September 2010, and I started the birth control around November or December (it's the lowest amount of estrogen one). And so I know that I've had anxiety before taking the pill and I've questioned having depression before it too, but I was never sure. And now, I think the birth control could possibly be causing my suicidal thoughts, and making my anxiety or depression, whatever it is that's wrong, worse. I don't want to stop the pill if this isn't the case. But I'm just so confused to as if the pill is causing this, or just making it worse? Should I go to a gynecologist for this?