This is Dr. David
nizoral is an antifungal shampoo.
so the flaky skin most likely is not a fungal infection
could be scalp psoriasis.
talk to your doctors about a steroid cream to see if that helps the flaky skin.
you might need to see a dermatologist and get a skin biopsy to diagnosis psoriasis of the scalp.
which should respond to steroid creams.
have you tried steroid creams on the area?
could also be bacterial infection of the skin, but that would be less likely.
I suspect that your service is not of substance!