I suffered from severe itchy flacky scalp and Seborrheic Dermatitis for over 3 years.
After surfing the web on day I came across this site www.refreshedskin.com , seemingly this site is created by people who suffered from SD and Ezcema.
I downloaded the program that they offered and 2 days after starting it my skin and scalp has really improved. My scalp now no longer flaky or itchy. I hope this site helps you as it has helped me and I wish you best.