Urinary problem. Interstitial cystitis?

So I am basically suffering from frequent urination and urge to urinate 24/7 since 5 months now. Have got all my tests done. Culture : negative Ultrasound : pvr volume is insignificant Urine routine : normal Uroflowmetry: normal I was misdiagnosed with uti and I took a course of antibiotics that did nothing. Then I went to a urologist who prescribed me tab bispec 5mg which I took for 12 days and did nothing at all. Since then I have been just finding ways to find what is the actual problem with me ? Is it overactive bladder or interstitial cystitis? I don't wake up at nights that's a blessing. But the urge doesn't go away when I am awake. I feel like urinating all the time. Also feel sense of incomplete voiding. Pressure on bladder. No pain but pressure. All the time.