Back in my teens and twenties you could guarantee I would pick a fight, at the same time of the month, with my boyfriend at the time. Some months were worse than others, but in the week before my period I would be irritable, tense and often a bit paranoid. At times it felt like I was going to burst into smithereens. Yet for the rest of the month I would be easy going and laid back. Looking back, I don't think taking the BCP helped at all, now I know I am progesterone intolerant, especially to synthetic progesterone.
Infact, when I started at university I changed my brand of BCP and within 3 weeks felt incredibly low and despondent, to the point of feeling quite desperate. It was horrible. I just felt totally disconnected from everything and everything seemed so negative.
Then I'd occasionally get a run of several days when I felt totally normal again. Looking back it was cyclical. ADs weren't nearly so common back then so I just suffered through it. But I do vaguely remember the depression quickly lifting when I came off that brand of BCP (wish I could remember which brand it was).