Thanks for your query at DoctorSpring.com
I understand your concern
Test for Lyme disease is not 100 % sensitive. Diagnosis is based on correlation of clinical symptoms, history and investigations. Bull eye lesion, if correctly observed and confirmed by a physician is pathognomic of Lyme's disease i.e. it is specific for the disease.
I would advice you take Lyme test again and also brain CSF examination for chronic meningitis to rule out the brain involvement
Plese get back to me with results
Fell free to discuss