Liesa: You should know that what Jim's doctor is doing, namely, giving your husband IVIG on an "as needed" basis (once he develops symptoms of an episode of SCLS), is highly unusual and conforms to no medical evidence or existing therapy recommendation.
I suggest you consult with other doctors there in Calgary with a view to getting him on a regular, monthly schedule of IVIG infusions -- and if you need some suggestions of doctors to see, let me know by writing to me at _aporzeca@american.edu_
As you wrote on your profile page, "It’s an exhausting way to live." Yes, and some might say it's also downright reckless.