This has been happening to me for the last six months, approx one a month. I will start to feel increased urgency to pee, then it will start to hurt when I do. Next I'll feel constant pee urges that only produce a few squirts and are extremely painful. This will go on for about eight hours. Azo sometimes helps, sometimes doesn't. I've gone in for urine tests that come back clean. Most of the time I can't get in while the symptoms are happening, so it doesn't surprise me there's no problem found. The urine usually doesn't have that funky UTI odor or appear particularly cloudy (I've had them in the past) although yesterday I started noticing very small red dots that could have been blood clots, I guess. It's quite frustrating and very unpleasant. I've had CT scans and a cystoscopy not that long ago and it came back negative. Anybody else experienced this?