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Hi! About two years ago, I had my only IVIG treatment. During my first infusion, I felt like my limbs were gradually getting heavier. Otherwise, I felt ok. On the second day of infusions, I started to get a rash and started to feel off. The “off” feeling was I had developed a rare side effect (or maybe a reaction) called hemolytic anemia. I ended up hospitalized for a few days as I lost half of my hemoglobin. That being said, IVIG seems to help a lot of people with autoimmune diseases, and I never heard anyone have a reaction like I did.
I hope you feel better.