Is it possible that you were infected with Lyme before you got pregnant? I know that there is a condition known as PANDAS, which stands for: pediatric autoimmune neuropsychiatric disorders associated with streptococcal infections and many children with Lyme seem to have this.
Just a thought about
how he may have gotten it.
If you think this may be a possibility, RowingMom on here is a good one to get a hole of and I'm pretty sure you will find her on this site as well: latitudes.org/forums/index.php?showforum=17
And I haven't read all of this thread, but I would suggest that you read here as well: latitudes.org/forums/index.php?showtopic=18447