If you find an engorged tick on you, the current approach is:
1) Remove it properly.
2) Take a precautionary dose of Doxycycline antibiotic (2 x 100 mg pills).
This will quell any possible infection at the early stages, rather than waiting for symptoms, getting tested, etc. The more established the infection gets, the greater possibility of permanent damage, and the more aggressive the treatment becomes.
Doxycycline is a prescription drug, however, most local pharmacists will issue a dose on request.