I Am Feeling Pain In Urine Bladder Since Four Years

i am feeling pain in urine bladder since four years that is from feb,2012 i took many medicine and visited several wel qualified urologist as per ultrasound report my prostate is normal and all urinary test ,PSA are normal the following medicine were taken frequently
1.lefloxacine 500mg for 4 months
2.ciproxcine 500mg for 4 months
3.Augmentine 600mg for 1 month
alongwith painkiller

Now adays the urologist surgeon has advised me Evergaba which is being taken.
please advise.
Thanks