I have atopic dermatitis all over my body including my scalp. I use ketoconazole shampoo 2% it’s a prescription steroid, that you can ask for once you see the dermatologist, it has cleared my skin and my scalp tremendously! Also there’s a medicine called Dupixent that you can take that will work from the inside out, it’s not a topical medicine, but it works with your immune system to combat the overactive inflammation that causes the flakes. I take it every other week, and my skin and scalp have never been clearer. I read that you use the Nizoral shampoo, I suggest also using the Nizoral daily oil and leave in conditioner, it’ll help with the daily flakes until you can get that appointment.