I was very surprised to read about the symptoms described in this thread, as they sound remarkably similar to what I have been experiencing for the past six months. I originally went to urgent care in July 2007 with awful flu-like symptoms: headache, nausea, slight fever, trembling, etc. I was diagnosed with a sinus infection and prescribed antibiotics. I felt fine for nearly two weeks before the symptoms returned. Over the next several months the symptoms came and went, and I saw numerous doctors. All my tests (blood work, MRI's, CAT scans) came back fine. I've had numerous theories as to what's wrong with me (fungal infection, depression, meningitis, etc), but no doctor could diagnose me with confidence.
I think I've been slowly improving, but I still find myself experiencing slight headaches, nausea, dizziness, fatigue, a sense of being "distant" from the world, and gloomy thoughts. When I asked my neuroligist again yesterday if he had any theories, he suggested it could be viral meningitis, but doubted it. After reading some of these forums, however, I am becoming more confident that this is what I had. The personal description of symptoms are much more revealing than what you find in books or diagnostic sites, which usually seem to describe viral meningitis as a one to two week ordeal.
I hope both of you are doing better.
-M