Since you're here, you're probably under some stress, even if it's subconscious. Hypochondria is a mean sucker - makes us anxious even when we're not aware of it!
As for what you describe - I've had that quite a lot. I used to get UTI tests every time, but most often they came back negative (though a couple of times I did have one). I still get a test if it lasts for more than a few days, but usually it comes and goes.
Also, I know you said for you this isn't a symptom of ovarian cysts, but that can change depending on the cyst. If it's bigger than normal or in a location close to the bladder, it can put pressure on it, making you feel like you have to pee when you don't.