When I had my first IVIG 5 years ago, I had been hospitalized for my first mg crisis. I woke up the 3rd day in the hospital (after my 2nd treatment the day before) and realized I felt fantastic! Had all the energy in the world, could breathe and didn't have droopy eye!
I went on to have 3 more treatments that time and I now get it IVIG regularly (one a week right now).
For me, the first treatment lasted about 4 weeks, had 2 more treatments and then had my thymectomy.
It works different for everyone, but here's hoping you wake up feeling great in the am