I am 20 yrs old and have been expirencing pain on my sides in between my stomach and lower back almost where my kidneys are. The pain comes on gradually and it will only last for about 2 minutes then it goes away. Its so severe that I had to pull over and jus sit until the episode passed so that I didnt lose control of the car. I've had exams that came back normal..ultra sound, blood work etc...all normal. I would really love to know whats going on because its starting to get worse as I get older and my doctor hasn't a clue...thanks in advance.