If all else fails, may be worthwhile going after the stone . In some women a cause
for UTI’s is never found, in which case a daily
dose of an antibiotic (usually Macrodantin/ Septra/Trimethroprim) is tried. As this last treatment was a problem for you, you may need to keep an antibiotic at home and take a short course when your symptoms flare.
I would get a CT urogram if nothing is found beforehand.
Good luck!
S.A.Liroff, M.D.