i think the active ingrediants are the same, they just have different labels for marketing purposes
I was taking effexor and something other than wellbutrin...but at the same time. i found that if i took all the effexor at once, i would go nuts. take it too far apart, and i would shake (and go nuts).
i AM taking wellbutrin now. i'm on 150 now, but when i was taking 300 (all in the morning) i was crazed and angry (side effects). so the doctor suggested taking it in the morning and then in the late afternoon. that seemed to work ok, but i switched back to 150 for other reasons.
anyways, i'd try doing what the dr says. see if it helps. if not, go back and tell your doctor that they are nuts :P