Wrote about this here

I'm fine three years later. Had another dose last year. Fever and doxy. No long term probs that I know about. Subsequent dx is harder as Rick said. There is new IgM, indicating a new infection, but the tests are pretty iffy. Mine came back "maybe" last year as a result, so I just kept eating the doxy and felt better. Not a big deal if you tell your doc you spend a lot of time in tick country.