I have been getting 2 IGIV's monthly for 18 months. I have never gotten any remarkable improvement like you did from the infusions.
I am better now but do not know what to attribute it to. IGIV's, cellcept or mestinon all while taking reducing ammounts of prednisone.
With the reaction you had from the infusions I would definetly try to do what
Juanitad suggested
Good luck;
Tony