What do you do for hair dandruff or oily hair ?

Bl

How do you get rid of it ? I'm 9 months pp and can't seem to ether the oily hair or hair full of Dandruff 😓 I've tried to use the dandruff shampoo's tried to switch shampoos nothing is working and I need help 😔

It's so bad that I need to wash my hair every other day or I can't go to public