Horrible acne, but really dry skin type?

I used to have oily skin in my teens, but ironically my complexion was clear. Now I'm 24 and I've had all-over acne since about 18/19 (mainly cheeks, but forehead and chin also). I thought acne occurred because the pores were blocked... But my skin type is dry to the point of discomfort? They aren't red angry spots - it's more like dry acne. My skin is constantly flaking and I have to apply cream immediately after showing or washing as it feels taut and uncomfortable. I do all the things I'm meant to do like use clean towels, patting dry, changing bed linen often and not washing in water that's too hot. But I never know what sort of face products to use? I spend so much money trying to find the right creams and cleansers, but nothing makes a difference. Can anyone help?