Hi, I experienced something similar to this. My hair was falling and I had flakes all over my scalp which looks like layer of dry skin. I consulted one dermatologist ( a very famous one ) and then after a few years, another one (again a very famous one). Now, things seem to work for me. So, the baseline is: If situation doesn't improve, just don't resign to your fate. Get a second opinion. Situtation might actually improve.
Please do consult another Dermatologist. If you believe in Ayurveda, try 'Brhingamalaka Tailam'