Welcome to HCM,
As your prostate
is not enlarged, operation is not recommended.
Have you tested your Blood sugar (F&PP)?
In my opinion, you must be suffering from U.T.I.
If your C & S report is normal, you might be suffering with non specific interstitial cystitis
For diagnosis, cystoscopy
You should consult an experienced Urologist
for examination and required investigations.
Thanks for your posting your query.
With good wishes,