I would like to try the IVIG. A couple months ago I had edema for a couple days in both feet, then broke out in hives. Doc thought it was one of my meds so I stopped it. It took a long time to stop itching. The doc gave me prednisone for the hives, and I hadn't felt that good in many months. I asked the pain doc about the IVIG, if it would work, and she said at the time she thought it would but wanted to get to the root of the issue before covering up my symptoms. Well, now I have a dx, so I should ask her again.