For anyone who has done IVIG treatment for their autoimmune.... Is it possible to start getting very bizarre flu-like symptoms that begin one week after you finish your first round of treatment. I did 5 consecutive days of treatment a couple weeks ago and aside from some increased muscle spams and slight increase in fatigue I did fairly okay. No major side effects. But one week after I finished, I started getting extremely achy, flu-like, nauseous, headaches, really bad cold sweats, slight temps, etc. I originally thought it was the flu or a virus but now I am thinking it may be related to the IVIG because I've had the symptoms for an entire week and they arent getting much better. So for anyone with experience, is it unlikely to start getting symptoms one week after you finish your first round of treatments or do you think this is a random virus/flu? I even developed these mouth sores which I have never had before in my entire life. I am completely unable to function from these symptoms. Thanks in advance for any feedback.