I don't think you have gone through enough antibiotics, either. Zithro dosing is 3 pills per infection..it has a long half life and stays in the body a long time. How many weeks of zithro are you doing? My llmd uses zithro with ceftin pulsing for 6 weeks at a time, but I don't have barts. Here's an older PubMed article discussing abx treatment regimens for barts:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC415619/

It appears that your doctors are trying you on all the relevant pain regimens available, with no success unfortunately. I'm sorry to hear that..life lived with pain you can treat is difficult..with pain you can't treat I can't imagine. I hope they find something that works for you soon.