Lyme disease is so much more than joint problems. There are over 200 symptoms associated with Lyme disease. Brain and nerve problems are very much a part of Lyme Disease. Here is an article showing some of the symptom overlap
http://www.lymeinducedautism.com/symptomchecklist.html
Thanks for the link; I know untreated Lyme disease spreads far & wide in the central nervous system. Here in NJ one of our previous governors had it (and to me it is sufficient reason to kill every deer in the state; I know other animals carry them, but they are #1).