The "war" for a few days after IVIG is normal. Not sure what they are treating you for though, as it didn't sound like Sjogren's if you have negative labs and a negative biopsy. Eye tests (Schirmer's) just indicate dry eyes, not the cause and there are a zillion things that can cause dry eyes.

I would explore a more thorough work up at JH or just continue the IVIG for a while to see if it helps. It doesn't sound like you've done but a few months, so maybe a longer trial would be beneficial.

If your rheumy thinks this is autoimmune, he needs to try and narrow it down to which disease (because I doubt it Sjogren's). Maybe seeing a rheumy at JH would be a possible path.

Either way, good luck.