Itchy Scalp Since Giving Birth? Natural Remedies?

I didn’t have this with my other births, so am not sure what to do. It can even sometimes be painful. Also, due to scratching I have slight dandruff, but I think the problem is more than that. I already take Vegan DHA that has improved my skin so much that I don’t have to use lotion daily in this Northern Virginia wintry weather. However, my scalp, even with me testing not washing everyday for two months, has not improved. I don’t wish to used Head and Shoulders or other medicated shampoos, but would prefer something that works from the inside out, like extra an extra vitamin or herb perhaps? Thank you!