I'm surprised your LLMD put you on such a low dose of doxy. Usually, the minimum is 300mg./daily with most prescribing 400-600mgs. I didn't herx from doxy when I was put on 200mg. but did when I increased it.
Which lab did you test with? IGenex seems to be the most accurate for Lyme as far as Western blots go. I've yet to test with them but am looking for a doc now that will draw blood for it. Good luck with your journey!