Doydie,
I was RX'd Clobex shampoo for itching scalp. I think it's also used for psoriasis. Have you heard of it or ever used it? I have three bottles unopened that I probably won't use now. I discovered I was allergic to something in my new pillow. I went back to my chicken feather pillow, go figure!
Now it's fine, the itching is gone.
BTW, I hope the phototherapy will help you a lot.