I have been on IVIG for almost 5 years. I started monthly infusions for 2 days and switched to 1 day infusions every 14 days. I would start experiencing minor aches and fatigue usually Wednesday evenings and Thursdays with infusions on Friday. My last 2 infusions I began symptoms on Monday, ended up taking Thursday off work, slept most of the day & received my infusion on Friday. I spoke with my Dr about possible dosage increase, etc & the Dr wasnt too worried about it. Has anyone else ran into this who has IVIG every 14 days ? Do I worry too much ?