I'm so sorry to hear about what you went through over a year ago with your first infusion of IVIG!
Your case is so unusual, because IVIG has been around for decades, so it is a medication that any competent doctor should know how to prescribe -- and every nurse and infusion center should know how to administer.
Moreover, it is an exceedingly expensive medication, so the usual problems we SCLS patients encounter is (a) we don't get IVIG as quickly as we should after going through episodes that other medications do not prevent, and (b) we may get too little, and not too much, IVIG -- because doctors and insurance companies are understandably tempted to keep costs down.
Even though there is no hard scientific evidence of how much IVIG patients with SCLS should get, or even whether they should get it, there are safe, recommended maximum dosing amounts set by the manufacturers of IVIG which should be respected no matter what illness you have.
For Privigen, for example, which is what I get, check out their website _www.privigen.com_ and look under "dosing information." If you know which IVIG you got, you can find out this information. It sets a standard that doctors and nurses should observe.
Moreover, there are precautions that must be taken, and so the fact that they didn't give you the recommended pre-meds may also have been a breach of proper medical procedure. Therefore, both the doctor and whoever actually administered the IVIG could be held responsible for what happened to you afterwards.
SCLS is a very difficult condition to treat even when patients are properly diagnosed, and thus many of us have almost been killed, or have suffered permanent injury to limbs and/or organs, even in the honest and competent attempt of doctors to save our lives. (And in my view some of us *have been* allowed to die needlessly.)
What to do about it is up to each one of us. In my case, I turned potential anger and depression into a constructive effort (largely by founding this RareShare site) to make sure others wouldn't have to go through what I went through. In particular, I wanted to avoid what the first 4 SCLS patients I ever knew went through -- namely, their untimely death.
Whatever you decide to do, don't forget to count your blessings every day: (1) you are alive; (2) it doesn't sound like you suffered permanent damage; and (3) you are getting IVIG and it is working for you.
(By the way, in order to get anywhere with a medical malpractice suit, I believe you need to prove that you suffered some kind of permanent financial or physical damage, which is then assessed for the purpose of seeking potential compensation.)