I had this, dont worry if it continues go to a doctor and some anti biotics will sort it out. I had this real bad, to the point of screaming. The doctor said i had a urinary bladder infection. There was traces of blood in my urine. Dont worry, it may not even be that, it may just be a thing that comes from time to time, i sometimes get a bit of stinging, trust me if you had that infection you would know about it..well.....everyone in a five mile radius would know about it.