Hi - don't know if you've found answers yet.
I also don't know if this may be a clue for you, but I had the skin on my face peeling almost in layers, always flaking off. Then it moved to my forehad and scalp.
As it turned out it was my thyroid. The Dr. did a test and said: there's ZERO activity from your thyroid.
Once I resolved that, my skin (and hair which was dry and brittle like hay and falling) returned to normal - with one exception: my eyebrows. They would still flake and peel until one day I decided to rub vitamin E oil on that and that was the end of it.
I imagine that you've had your thyroid checked but I thought I'd mention my experience just in case...