Frequent urination * 6 months. Help me.

I have been suffering from more frequent urinating problem since from 6 months ago..when i went to  go for pee after 1 min  urge to go pee again..when sitting or sleeping position urge to pee than stand or walk... difficult to start pee then start to stop pee..i feel bladder is not empty ..then i consult urologist ..he do cystoscopy then anterior Urtheritis can seen then he prescribed Azithromycin , Doxycycline, Cranberry extract softgel capsule , Nitrofurantoin, flavoxate & Alfuzosin hydrochloride..but not cure anymore..after 1 month  again i went to follow up then he do urine R/E ..but report is normal..then prescribed tab. Gabapentin 300mg for 15 days...USG & all the lab report is normal...but not cure iam go to pee 15/20 min difference now...what i can do report plz help me... Reports: Urea : 22mg% Creatinine : 0.7mg% Blood sugar( F ) : 96mg%