I think the thoracic nerve damage is from lyme. I would do what cave76 said above, find a llmd.
He ws probably treated by the IDSA's standard, which is not what Lyme knowledgeable doctors think is enough. Not by a long shot.
You're not crazy. Find an Lyme Literate Medical Doctor (LLMD), which is the Lyme communities name for a doctor that specializes in TBI's.
They're rare though. And because of the political/insurance companies actions, they often do not accept MediCare, MediCade or insurance. Sorry.