We are now one-week post IVIG, and I totally put stock in the idea that some of our kids can have a huge herxheimer reaction post IVIG. We kept giving our son stronger pain meds and it didn't help. We changed to round-the-clock Benadryl, Alka-Seltzer, and Epsom Salt Baths, and the difference was amazing. He's still got a bit of a headache, but nothing like before.
Better yet, we are now seeing the positive benefits of IVIG. Last night, he told us that all the "bad voices" in his head were completely gone. Other people (as well as our family) are noticing a big difference in his emotional state, and his ability to be calm.
I LOVE IVIG!