My daughter had Lyme, 3 forms of Lyme co-infectants, actually. She went undiagnosed for 4 years and during that time was tested for brain lesions, psychosis, every infectious disease that exists, and all were negative. It was a horrendous 4 years.
Finally I went to a website: www.lymenet.org and started looking things up. When you go to that site click on "flash discussion" on the left and there will be instructions on finding an LLMD doctor and lots of info.
Most importantly, make sure any physician you contact is a member (or supporter of, and by supporter I mean philosophically) of ILADS not IDSA. Those are two associations of Lyme researchers, etc. IDSA doctors generally do not support the concept of chronic Lyme or of Lyme having effects other than a brief flu-like illness. They believe the symptoms can be attributed to other things. ILADS supports the concept of chronic Lyme and all its effects.
My daughter's tests all came back negative. Her Lyme was actually the Babesia, Boriella and Bartonella parasites that were thriving in her red blood cells, lungs and ears. Because the parasites develop the ability to live with their host, and because they develop enzymes that protect them, a white blood cell test or test for antibodies will be negative. Fiinally a red blood cell test showed an active infection.
I wish I could say everything was better, but she still suffers some after-effects. But the horrible symptoms, at least, were resolved with antibiotics, anti-enzymatics, and several other treatments. It's still a road we're on.