I will check it out, it might be a urinary tract infection. All they will do in the clinic is take a urine specimen and test. try doing that and take it from there...
goodluck.
I bet before writing him up, they'd tell you to take him to the doctor.
I'm not sure what this is, but maybe a bladder infection or . . . I'm not sure. I'd get it checked. If he were ONLY doing this when he is asked to do school work, that would be one thing but since he does it at other times, check it out.