Hi BT! I think I would call your doctor and ask about what is happening to you. Could be the side effects causing it but then it might be the brand not working for you at all. No a pro on this IVIG stuff but have heard a few others say things about it that caused them problems at first. There are several in here that will come along and probably be more able to answer.
I wish you my best and sure hope you start to recover soon! Glad you posted to let us know how you are doing. Will keep you in my thoughts and prayers and hope you get well soon! Hugs