Hi Erin,
Did you have your eyes checked for glaucoma?
Because steroids can cause the inner eye pressure to rise and that might lead to (apart from severe vision problems, including cecity if not treated) eye pain…
Good luck with your IVIG, I had two series but they never installed a PICC line, just a small needle (I do not know the name) on the back of one hand and it was changed after 3 days…
Maurice.