Pain in left kidney, Enlarged spleen.

I am having light pain in my left kidney. I was a kidney stone patient. In night, I was working on computer and pain started. It was so severe that I had to lay down on the floor and then I vomited for few minutes. I was unable to walk on my own. My parents admitted me to the hospital. Doctor injected 2 pain killers one by one but nothing. At last, he made me sleep using some kind of sleep injection given through gluco ivf overnight. In the morning, I had no pain. I came to my home. Doctor gave me kidney stone syrup (pashanbhed, varuna etc) and antibiotics n pain killers. Next morning, the pain started again. I drank water, urinated and started walking to ease the pain. It stayed for 1 hour. Doctor said just take pain killer for now and continue antibiotics for kidney infection n UTI. (Oflox n ornidazile). It's 4th day nd I m still felling light pain. Note, there was no stones in ultrasound. May be it was gone or there was none. I also feel enlarged spleen. Plz suggest