I'm a seasoned pro with this issue. I got my first one at 10. Mine are not frequent but large and extremely painful. Uncomfortable doesn't cover it. My last one was bad. I was in pain for 22 days before it passed. The doctors couldn't figure out why I wasn't passing it as it was showing to be quite small at 3 mm. Finally after the 3 ultrasound was done they decided to do a CT. The CT showed it to be 1 cm and not 3 mm...why, because it was a rare form of stone made up mainly of uric crystals which are invisible to the ultrasound. They were only seeing the core which was 3 mm.

When you are not in pain drink a ton of water. Do NOT drink when you are in pain. When you are in pain it is because the stone(s) are in motion. Hot baths will help ease the pain. Make sure they give you a good pain killer cause when the stone moved you will need it. Also as the stone gets closer to being expelled the pain will be pretty bad as well. I would not wish the pain of kidney stones on anyone. You have all my sympathies.