Dear Raja. Thanks for your query and for using Health care magic.
I should tell you that I am a general physician and not a urologist
. However I understand your problem and can suggest you things which will help you take it further from here.
Based on the details given b you, it appears that you had UTI in past which was treated with antibiotics.
Even after complete treatment of infection, you continue to have frequent urination
(once every half an hour), intermittent flow and time delay to start.
USG abdomen is normal - No stone, no prostate
I assure you that it cannon be prostate related problem as such problems are usually seen in old age patients. At 23 its quite unlikely.
The Urinary Bladder
is supplied by nerves from lower spinal plexus (Lumbosacral Plexus)
If there has been any injury
to low back, there can be involvement of urinary bladder. make sure you do not have any such symptoms.
Also you should make sure that the urine cultures are sterile and not growing any bacteria
You should undergo what is known as Uroflometry. This will assess your urinary flow rate and volumes and help to find the nature of the underlying defect. Its a specialized ultrasound
testing done while you will be passing urine. It can be done at any hospital.
Based on this, further advice can be given.
Wish you good health
Thanks and Regards