The test results prove with 100% certainty you do not have syphilis and never did. Once positive, the FTA-ABS test remains positive for life, with only one exception: if syphilis is diagnosed and treated during the primary stage, some people's FTA-ABS results become negative. Since you were never treated, this is not a possible explanation in your case.
On top of that, the symptoms you describe don't sound like syphilis. It's a pretty rare infection, except in selected populations. There are only around 20,000 new cases per year in the entire United States.
Bottom line: you don't have syphilis. You'll need to work with your health care provider to look to other explanations for yoru symptoms.
Regards-- HHH, MD