Be prepared to get a bit tired after treatment
Good news about your IVIG. In my case it took about 6 hours at the start then went faster as I could tolerate it well. I received 80 mg (800 ml) per session 2 days in a row 3 weeks apart. I felt week after the first day but really picked up after the second. Mind you, when I started I was in a wheelchair and even needed a lot of help getting in and out of bed, you seem in a lot better shape, so the effect should be a lot less.