Re: fevers of unknown etiology
I would suggest re-visiting the lyme disease. 28 days is not enough to "knock" lyme disease out even in most of the simpler cases of it.
There are OTHER diseases, other co-infections, that accompany lyme. Most ppl with lyme have at least one other co-infection (babesia, bartonella, anaplasmosis et al). That infectious disease doctor was not worth his salt, as seems to be too common in my experience.
Please pay a visit to the lyme board for further information and to find a lyme doctor in your area. only doctors who see tick-borne illnesses day-in-and-day out will be able to diagnose or rule TBIs out with any sort of comfortable accuracy.
best of luck to you.