Hi everyone, sorry to hear about the UTI not clearing up. I know all about it. Gets worse as you get older. When I first started getting them, 1 dose of antibiotics would kill it. But your system begins up resistance over time, so beware taking antibiotics unless you are absolutely sure you have a bacterial infection. It could be something completely different, such as Interstitial Cystitis or an inflamed bladder / sensitive bladder.
I have two strong suggestions to make - the first is to read this book - it contains a wealth of information on UTI's, written by an American urologist for patients, so its easy to read. You will learn A LOT, esp how to avoid them again in future.
You Don't Have to Live with Cystitis by L. Gillespie
My second suggestion is to try alternative therapy such as homeopathy, esp when no bacteria is found. It can really help with the UTI sysptoms when there is no apparent infection there.