Thanks for your query.Based on the facts that you have posted it appears that you have severe pain
on left side (Renal Colic
Most likely this is due to presence of stone either in kidney or Ureter which can be confirmed only on ultrasound scanning of abdomen.
Please consult qualified Urologist
for clinical examination and get following basic tests done .
1)Routine urine test and urine culture done to find out the organisms causing this infection and antibiotics to which they are sensitive to.
2) Ultrasound scanning of the abdomen to rule out presence of stone either in kidney or Ureter,
Please take broad spectrum antibiotics like Cefotaxime
along with anti spasmodic like Spasmo Proxyvon
twice daily.and urine alkaliser thrice daily.
Get the prescription of medicines from your family Physician.
Ensure to drink more water .
If you have sever unbearable pain go to Er to get necessary treatment