Hello @jwovoss, Welcome to Mayo Clinic Connect. I know it must be difficult trying to find a treatment that helps for over 4 years. Here is some information that you might find helpful

National Organization for Rare Disorders: "What is the best antibiotic for Bartonella? - Bartonella henselae is generally resistant to penicillin, amoxicillin, and nafcillin. Doxycycline and rifampin in combination are the preferred medications for treating neuroretinitis"
- Bartonellosis: https://rarediseases.org/rare-diseases/bartonellosis/#standard-therapies

Clinicians | Bartonella | CDC - "A number of other antibiotics are effective against Bartonella infections, including penicillins, tetracyclines, cephalosporins, and aminoglycosides. Since aminoglycosides are bactericidal, they are typically used as first-line treatment for Bartonella infections other than CSD."
- https://www.cdc.gov/bartonella/clinicians/index.html

Have you thought about getting a second opinion?

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