My youngest son is now 8, and we had an issue like this for a long time also. (especially on road trips) He'd have to go so we'd take him, then about 5 minutes later he'd have to go again. We went to the doctor to make sure everything was ok, that there were no infections, or anything like that, and everything checked out OK. Over the last couple of years, he's decided he didn't like to wear underwear, and since he stopped (unless he's playing sports) we haven't had any issues. When I asked the doctor about this he said some kids react strongly to the sensation of underwear, and it gives them the feeling they have to go more often than they really do, and sometimes the elastic band sits just perfectly causing pressure on the bladder. I know it's frustrating, but take a deep breath, it will all work out in the end.