Thank you En bloc for your very detailed response. Can you answer another question. There are so many things I do not understand about IVIG. In your opinion, do you feel you improved significantly with IVIG. I'm really scared to start IVIG because the medications I'm taking somewhat help me. My SFPN is very severe, Full Body and this all happened within 3 years...since it's so severe is IVIG even worth a try, can it make this severe nerve damage any better? Will I have to be on it the rest of my life? Side affects scare me to death. And my biggest question, will I know right away wether IVIG is going to work for me after the first treatment? Thanks for being so patient to answer my questions. Jan