Incontinence

I have had pelvic pain on and off radiating from my gut about 1/2 way from my right hip to the center of my belly at the belt line. the pain goes from there to my penis and right testicle. I have had IC for 30+ years and am treated with Elmiron. I had a direct right igunal hernia about 35 years ago. I saw a Urologist after urinating they did an ultrasound and determined that I had completely emptied my bladder. The following week he did a Cystoscopy prior to the cystoscopy they inserted a catheter and drained 1500 CC of urine. During the cystoscopy they said I had a swollen prostate, and decided I have BPH. The reason I question all of this is I can urinate at the drop of the hat. I have a solid stream all they way through while I urinate. I pee about 150 to 200 ccs at a time and I urinate about 15 to 20 times a days and at least 5 times at night. I have a urine bottle bedside that holds 1000cc per the markings on the bottle. I never fill the bottle. I feel empty after I urinate. other than the 1500cc s they drained from me for the cystoscopy I do not have any symptoms of BPH except for frequency and I have had the frequency for 30+ years. What is the possibility that the DR is incorrect about the issue?