Thanks for your query.Based on the facts that you have posted it appears that you have Chronic UTI
. You have taken antibiotics and done almost all preliminary investigation which as per your statement are normal.
Since you have taken multiple courses of antibiotics and has no satisfactory results It will be better if you consult qualified Urologist
for clinical assessment.
He may do endoscopic examination of your urinary passage ( Urethra
) and bladder ( Cystoscopy
)to find out the cause of your symptoms.