scared.. please help

I had an appt. with LLMD today and she said that my CD 57 test indicates that I have chronic lyme.. that I've had it for at least six months.. my number was a 40.. i know that's low.. .However, I didn't have any symptoms until August that ever bothered me so I thought I had contracted the lyme in the early summer..she said it must have been activated by stress or something..... I do see an improvement in the 2 months since treatment... Does anyone else have a similar story? I'm not one of those people that went from dr. to dr. trying to find a diagnosis.. I got one relatively quickly, so now this is really upsetting...