Welcome, cmason ,

You didn't say how old your son was. If i were you I'd run, not walk, to another doctor who will take you and your son's care seriously. I don't know where you live or insurance information but I'd try to find out who specializes in lyme disease or infectious disease in your area.

Another source is this website:

http://tourettenowwhat.tripod.com/

The woman who runs it has a son with TS and also he had lyme. She is quite knowledgable about lyme.

I'm sorry that I don't have more specifics but keep looking and digging!!

Take care,
Tessa