Thank you, especially ellie, for the help.

Lyme has been ruled out by everything short of spinal tap analysis. (We've run all the antibodies, and done blood culture and PCR bacterial genetic analysis.)

I'll check out those other fungal infections you have mentioned. As a (former!) neuroscience research assistant myself, it's a little embarrassing I didn't know that a couple of those fungi could get into the CNS! =D

Also, I'm scheduled for a visit in a few weeks at the Indiana University Hospital's neuro-infection clinic... and I'm on the waitlist for an appointment at the Mayo Clinic. My neurologist is a great guy who wants to see me get better, and has written good referrals for me.