Oily Itchy Scalp Oily Hair, Itchy Scalp And Flaky Dandruff!!!?

Oily hair, itchy scalp and flaky dandruff!!!? - oily itchy scalp

Does anyone know a way? I wash my hair once a week, and my third day I began, very bold, and starts to smell bad. I feel much scratching of the scalp, leading to flaky dandruff. I look in the mirror, my scalp is flaking and cracking. I need help!