YorkieGirl, the reason I cannot take the Pill is that this is exactly what it used to do to me! Before the pill I was a happy carefree University student, when I got on the pill I became a demented, abusive, vile person. It was dh (then bf) who put 2 and 2 together, luckily we'd been friends for ages so he knew who I really was. I came off the pill and it was like someone flicked a switch and back came my personality! I've not touched it since, nor will I.
It does say on the instructions that it can cause depression, I guess everyone's depression comes out differently!