I know none of us react the same to treatments but I never had any problems with IVIG. I get a pretty fast rate usually in 2 hours. Never got any pre-meds. Once the next day I had minor flu like symptoms and a couple of minor headaches. I have been getting IVIG for a couple of years. It varies depending on my condition. My last one was 24 treatments over 2 months. Now I didn't like that because it took up a lot of my time. Think positive that it's all going to turn out well. Keep us posted on how you do.
Mike