I assumed they diagnosed Sjogren's by testing for raised antibodies. If you have it, I think you also get dry eyes/dry mouth, etc. I recall my doc testing for it a while ago, because it can sometimes raise thyroid antibodies (I think), but I didn't have the dry mouth problem and my antibodies for Sjogren's came back fine.
And for EBV, did you test positive for an active infection?
Seeing another neurologist and ENT is a good idea -- they can run some extra tests, although I wasn't fond of that muscle pin sticking/nerve test neurologists like to do.
For Lyme, I'm not sure if C3 is a great marker for it, exactly. I think a low level can indicate an infection, but it doesn't really tell you what is causing the infection. It's worth getting tested, and maybe CD57, but a low level will just tell you that your body is fighting something, but not necessarily tell you what -- or at least that is what I have been told.
I think a better test would be to get EBV and other viruses checked. If they all come back IGM negative, they are unlikely to impact the IGM portion of the Igenex test. Check for all co-infections, including rickettsia stuff. And do an antibiotic trial for Lyme -- if antibiotics don't provoke some sort of reaction, it may be something else going on.
Edited by nameless, 13 March 2010 - 07:41 PM.