Why is my skin and hair suddenly so oily?

My skin and hair have become so oily in the past 6 months that I'm shiny and dripping before I've even finished my makeup. I've always had combination skin but it's never been an issue. I use Avene, paulas choice and beaute Pacifique. 2% bha twice a week, low amount of retinol/vit a cream and a basic Avene moisturiser at night. Avene foaming cleanser and micellar water. The annoying thing is my skin is also dehydrated, with rough texture and fine lines appearing on forehead at end of day.

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