Hello, when I leave my hair unwashed for a couple of days and it gets dirty my scalp hurts when touching or moving my hair. It isnt in the whole scalp, just a part kinda in the back. My hair also falls a lot, I think, from the roots when I m washing and when it is dirty or a bit oily. it is been like this for a couple of years now, I ve been to a dermatologist before and shegave me iron pills but it didnt really solve the problem. What can it be and what can i do? Thank you for the attention.