Is Saint John's Wort really affective?

I have had really bad panic attacks and depression for a couple of months and it is really starting to take a toll on me. I made an appointment with my doctor and she pretty much told me that there was nothing that she could do for me, and that i need to go see a psychiatrist. I took it really offensively, and I am scared to go see another doctor and pretty much get told that I am lying again. It is a serious issue and I know that I need some kind of medication. Can Saint John's Wort help me with my panic issues?