IVIG Using GamuNEX-C 50gm

Hi Everyone,
My MG was in remission for about 7 months but just came back recently and has been very bad--diplopia, dysarthia, dysphagia and very weak neck muscles. I'm now taking Mestinon and have had three IVIG infusions every 3 weeks so far with GamuNEX-C 50gm. Previously, I was receiving GammaGARD 50 Gm and Iater was able to be controlled only by Cellcept. My doctor hasn't started me back on that medication yet for various reasons.
My question is this: So far it feels like the GamuNEX-C 50gm is not working as well for me as the GammaGARD 50 Gm did and I would like to hear from those of you that may be having or have had this same experience. Earlier this year, my insurer, BCBSMI, notified me they were switching me to GamuNEX-C but because I was then not having any MG symptoms I didn't question this. I hope all of you out there are doing well with your MG. Thank you!

Karen