I have had six IVIG treatments over the first year of my journey and did not have any reaction at all. The only thing that it helped was slightly reducing the spasms of SPS no other improvements.
Sorry you are having such a hard time. It could possibly be the meds that you're taking but how would the medical community figure that one out when they have such trouble diagnosing the illnesses in the first place.
Good luck.
Becky
Southern Bell