pdessena, I am not a Lyme expert, but have done lots of reading. It is generally recommended the abx for 6-8 weeks, I believe. Because the spirochetes reproduce every 4 weeks, most LLMDs believe the abx must be taken for at least 6-8 weeks, to knock them all out.
I'm sure you can find some expert advice on treatment of Lyme (like Dr. Burr) and print it to take to the Dr.
I will defer to anyone on here who has other advice.