Hello and Welcome Poucho,
I just wanted to reach out since you are new.
I have not had IVIG so can't speak to this personally but I do find the research intriguing. For those of us with a lot of allergy, immune-y type things it is certainly a thought. If it were a bit easier to access here in the states I would have considered it for myself.
I hope you find what you need and wish you relief and healing.