I thought I'd add my own diagnosis here too. Though it's more like a fraught journey to getting one. Sorry, it's a long story.
First off, I'm convinced that "OAB" is urologist code for "we recognize something is going on with your urine retention and/bladder, but we don't know what. So, let's throw pills at it and see if it makes you go away". Never settle for an OAB diagnosis, or more pills, it does nothing for you.
So I started off with a major auto accident that put me into a wheelchair for 3 months and then a long leg cast for 3 more. I found I couldn't make it to the bathroom in time, so my urologist said it was just my limited mobility. Official diagnosis: functional incontinence related to mobility. Nothing to worry about or look into, and that I should manage with diapers for the time being.
About 6 month later my mobility slightly returned, yet I was still having problems making it in time. A new urologist, and I got a new diagnosis of OAB. And began trying a different pill every 3-6 months. I was also subjected to multiple urological diagnosis tests. Of note here: this test has you empty you bladder and measures output rate and volume. Then they put a catheter in you, and slowly fill our bladder. You call out when you feel it and again when full. Then they have you pee past the catheter as much as possible to measure pressure, rate and volume. Me though, i could never pee past the catheter so that always invalidated the test.
All this occured during at least another 5-7 years. I moved, twice, so add another new urologist each time, but no actual changes. And had an insurance change too, so more of the same yet again.
Eventually I was fed up with the non-support I was getting and switched urologists- yet again. This doctor actually talked to me to come up with a new diagnosis, but also made sure to include another diagnosis test- which i again failed for results. New diagnosis, Severe Urge incontinence. Followed up by even more pills every 3-6 months. Uuugh.
Another point here, with all the pills. I found if I refused any more pills then every single urologist would get stuck on that one pill. Likely thinking it "would work" if only I gave it a real try. They'd be so hung up on that, they couldn't look past it and move on to something else. So, after many refusals I found it was faster and easier to just take them and prove they don't work, or worse ad bad side effects.
Eventually, after 18 plus years I landed at the Mayo Clinic in Florida. Finally I had found a urologist who would listen to me once again. He deduced the reason why I failed the test was two parts. First the catheter used in the tests was too big for me. And second I was experiencing too much pain to just bear through it. So, one strong pain pill before hand, and a child's size 8fr catheter and I barely got through it. My internal bladder pressure was literally off their normal chart space. In fact, it registered 3-4x higher.
New diagnosis, Sever Urge Incontince coupled with a Neurogenic Dyssynergia Sphincter (basically, my muscle wiring was crossed and instead of relaxing to pee my muscles was clamping down instead). Gee, go figure. But FINALLY, a proper diagnosis.
From there we then determing my sphincter had to be bypassed, and my bladder couldn't be allowed to fill. That was the only way to alleviate both diagnosis, and that no pill would have ever helped me. He was concerned this would make me incontinent though, and hesitated. Up until I pointed out I had been incontinent, and needed diapers, for the previous 18 years. The surgery would though alleviate my inability pee, completely remove my painful urges, and greatly improve my quality of life. I was then scheduled for what would be the first of 15 surgeries to get me there.
In the end it took me out 20 years to get the right diagnosis, AND to get me properly treated. So if you've read this far, my advice is DO NOT SETTLE, not for an OAB diagnosis, not for more pills, and definitely not another quack urologist who isn't even willing to spend the time and listen to you.