I can not claim to have had any personal experience with an autoimmune disorder but I can point you in a direction and hope it shortens your path to health.
You can find a list with information here the little I do know is that the causes can be varied and in general there are benefits to overall improving the health.
If you are dealing with an autoimmune disorder you might investigate the supplement IAG, Arabinogalactans, from Biotics Research to assist you in your healing.
All Rights Reserved Bill Gustafson 2008