This is not as bad as it seems to be. I am sorry that u have been suffering from an ailment which can be cured easily, but it does not have a known cure in Allopathy. But there is a cure for such scalp disease in Ayurveda / Homeopathy.
I am an MBBS doctor abd have started practicing alternate medicines in past 10 yrs.
I formulated a shampoo for myself (cos i suffered from dandruff badly), and shared it with friends and the shampoo has been tested succesfully by more than 4000 users. Why dont u try this special shampoo - http://www.doctorherbz.com/products/shampoo.html
This is 100% guaranteed that your Dandruff will be cured.
Besides this, send me your complete details along with ur medical reports. I am sure I can be of some help to you.