Ok, so this happens to me every so often and it usually lasts only a few days. What happens is, I will feel like my bladder is full and that I'm about to pee myself so I run to the bathroom but I only pee a little bit and it's usually clear. I don't drink a lot even though I should, and as of the past week I haven't exactly eaten a lot either. And when I do eat, its not always healthy. I don't know if my diet has something to do with this though. I don't get headaches and I don't feel dehydrated either. It just feels like an intense need to pee but it's never a lot when I do go. No pain or anything associated with this and no blood.