My son was taken to the ER with lower abdominal pain yesterday and diagnosed thru CT scan with a small seed sized kidney stone in his ureter. After being discharged he had a little vomiting when he had drank a Gatorade. He is on percocet and Flomax. Today the pain has traveled to the right lower back and whenever he tries to eat he throws up the food. Are these normal things associated with the kidney stones? He is 22 years old and this is his second stone in three years. He did not have the same symptoms the last time he had a stone. He said that he is finally urinating, where he wasn't able to yesterday. He said that the urine is normal color, no blood. His pain level is at about a 3 in his back. should I take him back to the ER for these new symptoms or are they normal?