Hi Guy,
I can only share my experience, I was on IVIg for one year. For me - it was a horrible treatment. I don't remember hearing of any organic way of treating this illness. Also be aware that different makers of the medicine can cause reactions that can cause bad rashes, skin burning, skin falling off, some makers of the medicine can cause violent nausea and vomiting. So you have to decide which side effect is the better one to deal with.
Sorry to bring you bad news, but the Dr's won't say anything unless you confront them. But you need to know what to ask them. Keep reading this site. Also John Hopkins also has some info for you.
Rich, Mount Joy, PA USA
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Remember to treat people the way you want to be respected.