St. John's wort no longer working

Since June, I have been taking St. John's Wort 3x a day. For the first month or so, it worked great. I had felt happier and less blank than I had in at least a few years. I thought it was great because it worked and had so few side effects, compared to prescription antidepressants I've taken. But after that, I've pretty much gone back to how I was before. Recently I have stared to lower the dosage and plan to stop taking it completely in a few days. It causes me intense headaches several times a day, and it's not worth dealing with if I'm not getting anything out of it. I've tried 5HTP, Sam-E, etc as well as prescription antidepressants (Zoloft, Lexapro, Wellbutrin, etc.)

I've been thinking about going back onto Wellbutrin XL (or XR?, I'm not sure), as it seemed to work the best of all the antidepressants I've tried, but I'm not sure because when I had first started to take it, I would have really extreme outbursts and start freaking out over really ridiculous, insignificant things. Screaming and crying hysterically and uncontrollably for hours, breaking things, etc. It was extreme enough that my mother almost sent me to the psych ward during one of the outbursts. It went away eventually, but I don't know if I want to deal with that again? I' can't remember why I stopped taking it, actually. I'm currently a college student, and have dropped out before because of depression/social anxiety, so I think I should do something to keep that from happening again, but not sure what?