There have been some new studies that show that lingering Lyme symptoms are probably caused at least in some cases by "persister" bacteria, that go into a defensive mode during the first deluge of antibiotics and then live to re-infect you after the antibiotics are over. Similar things happen in leprosy and TB if I'm not mistaken. The latest research is about how to kill those persisters. Disulfiram, aka antabuse, is currently in clinical trials, and some doctors at specialty clinics are also using a triple antibiotic cocktail to try to achieve the same effect. I would recommend traveling to one of those clinics if you can afford it...of course they don't take insurance.