Hey Molasses,
I am sorry you find yourself here. We have one member here that uses IVIG. We have another that uses it for ideopathic anaphaxisis instead of MS. She has told me that she can occasionally get a headache afterwards. There is the slight chance of an allergic reaction. I have not heard of anything other than that. I wish you the very best of luck with that. Please come back and tell us how you are doing.
Welcome to HW.