Hi everyone. I've been on IVIG for more than a year. It is really helping with my symptoms but each time the side effects feel a bit different. Sometimes I get a sore throat, sometimes canker sores, sometimes headaches and backaches, and sometimes nausea. Honestly, the first couple days after a treatment I usually feel pretty lousy. On rare occasions I feel nothing and am immediately back on my feet! Has anyone else noticed that side effects from this treatment vary? Does anyone know why this is happening?