Brandon-
I have been getting IVIG treatments since I was first diagosed which was 17 years ago. Each person reacts differently to it as well. I used to get really high fevers, the chills, bad body aches,vomiting, and a headache that lasted for days. Through the years though I came to find out that hydrating with gatorade the day before the treatment, during, and even the day after helped alot.( As well as taking tylenol ) Also you might want to stick with a certain brand of IVIG too. I am still getting the treatments once every 3 weeks and keeps me going. Good luck!
-Tracey