Hello Welcome to HCM, Your history and symptoms suggests that you have UTI secondary to Bladder Neck Obstruction. Bladder Neck Obstructions causes incomplete emptying of bladder during micturition resulting in to some amount of urine remaining in bladder .This stagnated urine ids the source of infection and getting UTI. Taking antibiotics will solve your problem temporarily. I would advise you go for endoscopic incision of bladder neck (Bladder Neck Incision) so that your bladder neck will remain wide open and help in emptying bladder completely during every micturition ,and there by prevent frequent episodes of UTI. This is simple surgery you need to consult the urologist for opinion and treatment. Thank you