Most people would get IVIg on a regular basis do just fine. Many, myself included, get occasional headaches; hydrating ahead of time and keeping the infusion rate slow helps prevent this. It's not unusual for the initial loading dose (which is an extra large dose) to cause "flu-like symptoms", which include severe headache, chills, and vomiting. This has happened to me twice in 4.5 years.

Maria's experience sounds somewhat like this, only more severe. The kind of meningitis associated with IVIg is *edit*
It's becoming more common for people who do experience regular side effects, despite changes in brand, to switch from intravenous to subcutaneous administration of their immunoglobulin.