Suggest Treatment For Rash On Body

I have been receiving infusions for CIDP and have developed a severe rash all over my body from head to top. I have had infusions of steroids and they were not successful. Also, I have been to many doctors and no one seems to know what to do. The rash is getting worse by the minute. Could you possibly suggest to us something to do for this very rash--it stings, burns and hurts very badly. I have had 14 infusions of IVIG and 3 of steroids.which did not help. Could you please help us. Thank you Bud Kelley