Here's a link (from the sticky above) that might help you with some answers to your questions.
http://www.canlyme.com/
I guess the biggest question right now is does your son have a rash or the bullseye? Those are two identifiers that she may very well have Lyme.
I agree with Chemar, the sooner the treatment begins, the better.
The sticky above has lots of information. I hope you get some answers quickly.