I went to hospital Wednesday after shaking profusely an vomiting. I was immediately taken in to the emergency room hooked to an IV and told I passed a kidney stone, I was then was sent home only to wake up the next morning shaking and vomiting again and was taken by ambulance again to the emergency room and spent a couple of days in the hospital and was given a prescription for of levofloxacin 500 mg's. I am also going to make an appointment with a urologist after I finis my med's. What I want to know is what causes kidney stones and I must have passed a more than one. Is it possible to pass more than one?