Hi Chris,
I don't have the same diagnoses as you, but thought I'd respond to your post anyway.
Your keeping a journal idea is great, and I actually recently started to do the same for myself in regards to the symptoms I'm experiencing with my Small Fiber Neuropathy and trying to see if anything I do or eat makes the symptoms better or worse.
How are your symptoms now with the ivig treatments?
Wishing you all the best.

Miriam