Thanks for your query,based on the facts that you have posted it appears that you have UTI mostly secondary to enlarged prostate
and have been taking Cefexine as per culture report for last 10 days But there is no satisfactory relief from symptoms .
You have enlarged prostate which leads to obstruction to outflow of urine resulting into stagnation of urine in bladder (Residual Urine) which gets infected giving rise to symptoms of UTI.
Please change the antibiotic as per culture report and consult qualified Urologist
for clinical and digital rectal examination
.You may need to take alphs receptor antagonist like Tomsulosin which will help to improve urine outflow and to combat infection.